officejax currency trading information

Channel



Ad your free banner at www.AdViews.info

 

Options Trading - Advantages and Disadvantages


What is Options Trading?

An option is simply granting someone the right to buy or sell something in the future. In the case of Dow index futures options, when someone buys a Dow call option they are buying the right to purchase that underlying Dow future at a specific price, known as the "strike price," at a future point in time, known as the "expiration date." When an investor buys a put, they are essentially selling the market; a call essentially buys the market. Likewise, selling a put essentially buys the market; selling a call essentially sells the market.

In order to receive the opportunity to buy an option on this future, investors pay a "premium." If the market does not reach the strike price of the option, then that option will expire worthless on the expiration date. If the market does reach the strike price of the option on the expiration date, then the investor will be assigned the underlying future at that strike price.

Advantages of Options Trading

Flexibility. Options can be used in a wide variety of strategies, from conservative to high-risk, and can be tailored to more expectations than simply "the stock will go up" or "the stock will go down."

Leverage. An investor can gain leverage in a stock without committing to a trade.

Limited Risk. Risk is limited to the option premium (except when writing options for a security that is not already owned).

Hedging. Options allow investors to protect their positions against price fluctuations when it is not desirable to alter the underlying positon.

Disadvantages of Options Trading

Costs. The costs of trading options (including both commissions and the bid/ask spread) is significantly higher on a percentage basis than trading the underlying stock, and these costs can drastically eat into any profits.

Liquidity. With the vast array of different strike prices available, some will suffer from very low liquidity making trading difficult.

Complexity. Options are very complex and require a great deal of observation and maintenance.

Time decay. The time-sensitive nature of options leads to the result that most options expire worthless. This only applies to those traders that purchase options - those selling collect the premium but with:

Unlimited Risk. Some option positions, such as writing uncovered options, are accompanied by unlimited risk.

Overall Options present a good opportunity to formulate plans which can take advantage of volatility in underlying markets as well as price direction. However for most traders the disadvantages are significant and online futures trading is usually a better option.

Tim Wreford runs Online Futures Trading, a website that provides information and resources for traders. Tim also provides a free day trading system, the results of which are updated daily on the site.


TODAYS NEWS BY OFFICEJAX FREE ADVERTISING AND AD EXCHANGE SOLUTIONSMORE RESOURCES updated Tue. June / 18 / 2019

What Are The Benefits Of Forex Trading?  ValueWalk

As already mentioned, Forex trading does not cost a lot of money if you are beginning, especially when compared to equity markets.


Major currency pairs  IG

Discover what the major currency pairs in the world are and how you can trade them.


Never lose hope in currency trading business  Rocky Mountain Collegian

Sponsored *Content*: Never lose hope in currency trading business A good trader will know about the right kind of performance in the business. It is very.


Banks accused of overcharging small customers for forex services  Financial Times

ECB paper finds hedging rates can be 25 times higher than those of bigger clients.


Trading Sardines: The Case Of Currency Hedged Negative Yielding Bonds  Forbes

Due to the large short term yield differentials across major bond markets, currency hedging is being used to turn negative yields into positive currency hedged ...


Facebook launches a new cryptocurrency called Libra  CNBC

Facebook will also create a new subsidiary, Calibra, to build a digital wallet for people to store and exchange the currency using apps.


Forex Trading Opportunities for the Week Ahead [Video]  FXStreet

About the Author Sam Eder is a currency trader and author of "The Definitive Guide to Developing a Winning Forex Trading System" and ...


Asia markets mostly higher; Fed meeting set to kick off  CNBC

Markets in Asia were mostly higher on Tuesday as investors awaited the start of a closely-watched meeting by the U.S. Federal Reserve, set to kick off later ...


FCA Advises Traders to Avoid Forex ‘Education’ Firm  Finance Magnates

The FCA advised members of the public against doing business with Bucketlist Traders this Tuesday. The firm allegedly provides forex education services.


Nigeria's Retail Forex Trading Market is Emerging - Report  AllAfrica.com

Forex market has been around for quite some time now, and it is one of the largest financial markets in the world. It involves trading in the currencies ...


Pound to euro exchange rate: GBP hits six month low as currency plummets  Express

THE POUND slumped against the euro for the third day in a row yesterday sending GBP plummeting to a new six-month low against the euro. The exchange ...


Where Is the Best Place to Exchange Foreign Currency?  U.S. News & World Report

Consider trading your U.S. dollars for foreign currency before you start your vacation so you can find the lowest fees and the best conversion rate.


Why bitcoin hasn’t gone to zero and is now knocking on the door of $10,000  MarketWatch

The world's No. 1 cryptocurrency is on fire, with a price approaching $10000, pushing the digital asset near its highest level in more than 14 months,...


Stock vs. Forex Trading: Which Investment is the Riskiest? -  VENTS Magazine

Traders and investors have a hard time deciding which market to channel their efforts to. In such quagmires, a trader's trading style and risk tolerance come into ...


Currency Exchange Software Market is Expected to Register a CAGR of 12.50% During the Forecast period of 2019-2024  Market Research Gazette

This report helps to analyze competitive developments such as Joint Ventures, Strategic Alliances, Mergers and Acquisitions, New Product Developments, And ...


As Recession Fears Grow in Europe, Central Bank Signals Stimulus Increase  The New York Times

Mario Draghi, the central bank's president, said “additional stimulus will be required” unless the economy improves. Action could come as early as July.


Best platform for Forex trading  Augusta Free Press

Forex or as most people know it, foreign exchange, is a decentralized world market where people can trade, buy or sell currencies.


This Week In Forex, Crypto, And Stocks -- June 18, 2019  Nasdaq

Hi investors! Here's your 5-minute overview of the forex, crypto, and stock markets with hot stories that may have an impact on your investment.


How to Trade Forex | Forex Trading Examples  IG Bank

Follow six steps to easily start trading forex. See forex trading examples, learn how FX markets work and find out what you need to do to place your first trade.


Coinbase launches its cryptocurrency debit card in six more countries in Europe  CNBC

Digital currency exchange Coinbase announced Wednesday its Visa debit card is to launch in six more European countries after debuting in the U.K. in April.


Singapore Spurs Development of FX Trading Hub & Ecosystem  Finextra

With the uptick in Asian currency trading and the growth of electronic trading, Singapore's regulator is working with the financial industry to build an FX trading ...


Top 8 Forex Trading Strategies and their Pros and Cons  MENAFN.COM

(MENAFN - DailyFX) top forex strategies Main talking points: What is a Forex Trading Strategy? Forex Strategies: A Top-level Overview Forex Trading Strategies ...


Forex trading volumes fall 9.6% to $1.62 trln in May - CLS  Nasdaq

LONDON, June 10- Average daily foreign exchange trading volumes fell 9.6% year-on-year in May to $1.62 trillion, CLS said on Monday, as calmer.


Learning the basics of forex trading  The Financial Express

You need to invest through a Sebi authorised broker to ensure that your forex trading actions are legal.


Gold Price Gears Up for Another Shot at Big-Picture Breakout  DailyFX

Gold prices have remained on the move so far in June, but a big area of long-term resistance has come back into play. Can buyers finally elicit a push beyond ...


The bogey of currency manipulation  BusinessLine

Which emerging markets have seen significant depreciation in exchange rates? And should 'manipulation' be blamed for that?


RBI to set up forex trading platform for SMEs, get more players for Small Finance Banks  Economic Times

The Central Bank now proposes to include more players to enhance access to banking facilities to the small borrowers and to encourage competition.


CFTC Lawsuit Alleges $147 Million in Bitcoin Defrauded From Trading Scheme Investors  CoinDesk

The Commodity Futures Trading Commission (CFTC) announced the filing of a civil enforcement action against Control-Finance Limited, a purported Bitcoin ...


Kiwi Price Outlook: New Zealand Dollar Counter-Offensive, First Test  DailyFX

A defense of the yearly lows in Kiwi has the recovery testing initial resistance targets ahead of the Fed. Here are the levels that matter on the NZD/USD price ...


RBIs move to introduce forex trading platform to hit fee income of banks  Business Standard

The Reserve Bank of India's (RBI's) move to introduce a foreign exchange trading platform for retail customers is set to hit the fee income of banks significantly.


AM Forex Broker enters the Kenyan market  The Standard

Sponsored *Content*. Institutional Forex & CFDs provider AM Broker is looking for new local representatives and affiliates to "to lead and operate our planned ...


Stocks in Asia Pacific mixed amid tensions in the Middle East  CNBC

Shares in Asia Pacific and oil prices were mixed on Friday, following attacks on two tanker ships in the Gulf of Oman on Thursday.


USD/CAD - Canadian Dollar Trading Sideways  Baystreet.ca

The Canadian dollar pretty much stayed put overnight. There was no shortage of data or central bank-speak, but none of it was directly aimed at the currency.


Trade currency pairs: your guide to trade currency pairs  Capital.com

Trade currency pairs CFDs, shares, commodities, cryptocurrencies and indices through Capital.com's award-winning platform. No commission. FCA and CySEC ...


China shares tumble amid trade jitters  CNBC

Treasury Secretary Steven Mnuchin told CNBC that a trip to Beijing to resume trade negotiations has not been scheduled yet, reducing hopes of a speedy ...


UPDATE 1-Rand rallies as Ramaphosa set to give more support for Eskom  Reuters Africa

(Adds latest prices, Eskom details, analyst quotes). JOHANNESBURG, June 18 (Reuters) - South Africa's rand rallied in late trade on Tuesday after the ...


Forex Trading  Emirates Business 24/7

We reveal everything you need to know about forex trading as a beginner - the basic terms, how to start and what to look for.


Best forex trading strategies and tips  IG

Discover ten of the most popular forex trading strategies – including using Bollinger bands, Fibonacci retracements and the Bladerunner strategy.


Forex trading for retail investors  The New Indian Express

Initially, the facility will be available only for US dollars, but more currencies will be added gradually. The minimum order is $1,000 with multiples of $500 thereof.


Current currency trading is manipulative, says Dr M  New Straits Times

TOKYO: Malaysia is proposing a new currency based on gold as it is more stable as opposed to the current currency trading which is manipulative, says Prime ...


Asian markets mixed amid geopolitical developments  CNBC

Stocks in Asia were mixed on Monday amid a series of geopolitical developments across the region. The Nikkei 225 in Japan added 0.24% to close at 21,301.73 ...


EURUSD Squeezed Towards Key Support Zone  Forex Crunch

The European single currency weakened since 2019 started as both geopolitical tensions between the US and China, and tensions rising between countries.


Citibank, UBS, JP Morgan, Barclays and RBS sued for rigging currency exchange rates  ABC News

The world's largest investment banks — UBS, JPMorgan, Citibank, Barclays and the Royal Bank of Scotland — have been sued for allegedly rigging currency ...


Why Yuan at Seven Would Risk Further Inflaming Trade Dispute  Bloomberg

The yuan's recent slide risks re-igniting one of U.S. President Donald Trump's favorite criticisms of China: that Beijing weakens its currency to aid exporters.


USD/CAD Canadian Dollar Flat Awaiting End of Fed Meeting  MarketPulse

The loonie was nearly flat against the US dollar on Monday. Crude prices retreated from their supply disruption highs after the attacks in the Gulf of Oman and ...


Barclays and RBS fined by Switzerland for currency rigging  Sky News

Five banks are accused of rigging the foreign exchange market following an investigation in Switzerland.


Dr M proposes new currency for East Asia - Business News  The Star Online

TOKYO: Malaysia is proposing a new currency based on gold as it is more stable as opposed to the current currency trading which is manipulative, says Prime ...


Sterling Trading Lower In The Morning Session  Action Forex

For the 24 hours to 23:00 GMT, the GBP declined 0.46% against the USD and closed at 1.2538, amid raising concerns over no-deal Brexit as Boris Johnson is ...


Millions lost in 'celebrity-backed scams'  BBC News

Celebrity influencers are being used to promote crypto-asset or currency trading schemes which are scams.


Daily Currency Trading Tip For May 22 - Short Pound, Short Australian Dollar-Yen, Buy Gold  Exchange Rates UK

Our guest analyst, Marshall Gittler, makes these three trading recommendations for trading on May 23rd. Stay short GBP. It's hard to imagine that things could get ...


Forex Trading For Beginners  Emirates Business 24/7

In this forex trading for beginners guide we reveal the basic forex trading expressions, what it is and how you can get started with it.


The dollar is little changed as the week's trading gets going  ForexLive

The week is off and away but not far from the Friday levels. The currency week is off and away with the major indices + or - about 6 pips. Versus the Bloomberg ...


Why forex trading is an ideal home business venture | Business Leader News  Business Leader

Foreign exchange trading is an increasingly popular way to make money while working from home, and with application, discipline and hard work it can be ...


Dollar edges up on trade, political worries  Reuters

NEW YORK (Reuters) - The dollar edged higher against a basket of currencies on Tuesday, lifted by trade and political worries and a strong rise in U.S. ...


Italy’s Mini-BOTs: Fiscal Stimulus or Illegal Parallel Currency?  DailyFX

Italy's politicians continue to keep markets on edge as their budget indiscipline intensifies and talks about further debt issuance are re-ignited. Italian 10-year ...


GBP Could Be Hit if US-China Trade War Makes London Pick a Side  DailyFX

London has just opened a stock trading link with Shanghai; This is emblematic of Britain's relationship with China; However ties to the US are older than stronger ...


Ongoing Political Limbo Making Life Hell For Currency Traders  Investing.com

The pound sterling held its own as the March 29 deadline for Brexit approached and FX traders maintained hope that reason would prevail and a long transition ...


Is crypto-currency trading exempt from GST/HST?  Canadian Accountant

TORONTO – To date, the Canada Revenue Agency treats Bitcoin—and crypto-currencies in general—as a commodity for tax purposes. As a result, the CRA will ...


Current currency trading is manipulative, says Malaysia's Dr M  Salaam Gateway

Malaysia is proposing a new currency based on gold as it is more stable as opposed to the current currency trading which is manipulative, says Prime Minister ...


Loonie Trading A Tad Higher In The Morning Session  Action Forex

For the 24 hours to 23:00 GMT, the USD slightly rose against the CAD and closed at 1.3410. In the Asian session, at GMT0300, the pair is trading at 1.3404, with ...


EURJPY, EURUSD Rates Hit by Selling Pressure after Draghi Comments  DailyFX

With ECB President Mario Draghi talking up the possibility of more stimulus, the Euro is under renewed pressure across the board.


Rupee Moves Above 70 Mark Against Dollar  NDTV News

The rupee appreciated by 79 paise to 69.44 against the US dollar in early trade on Monday, a day after exit poll results suggested another term for the ruling ...


Short Aussie, long yen is the hot new currency bet for trade war - Business News  The Star Online

SINGAPORE: Short Australia's risk-sensitive currency against the haven yen.


Crude Oil Price Downtrend May be Over - Implications for USDCAD Rates  DailyFX

Crude oil prices have closed below their daily 8-EMA every session since May 22. The bullish key reversal forming today suggests the downtrend may be ...


Japan Hopes to Set Global Crypto Law Benchmark With Latest Regulatory Update  Cointelegraph

While Japan's new laws are welcoming for most crypto exchanges, as they expect more institutional investors, custodians and wallet makers are getting worried.


Forex Trading: AUDUSD Pulled Back to $0.692 Level, Bearish Trend May Continue  ForexTV.com

Should the Bears exert more pressure, further declination in price is certain and the currency pair may target $0.680 level. In case the Bulls prevailed over the ...


Future Returns: The Risk and Reward of Foreign Currency Exchange Markets  Barron's

While most advisors recommend leaving the foreign currency exchange market to the pros, individual investors are increasingly entering the market as ...


USD, Gold & Stock Price Volatility Eye Looming Fed Meeting  DailyFX

What might implied volatility measures suggest about the next direction in spot gold, the US Dollar and stocks ahead of this week's FOMC rate decision?


RBA Minutes to Offer AUDUSD Little Relief Ahead of FOMC Meeting  DailyFX

The RBA Minutes may do little to prop up AUDUSD ahead of the FOMC meeting as the exchange rate extends the series of lower highs and lows from the ...


Venezuela loosens currency exchange controls to allow forex trading  Reuters

CARACAS (Reuters) - Venezuela will allow local banks to open foreign currency trading platforms as part of a loosening of the OPEC nation's exchange controls ...


Gold Prices Rally On Specter Of Easy Money From Central Banks  Kitco News

Editor's Note: Get caught up in minutes with our speedy summary of today's must-read news stories and expert opinions that moved the precious metals and ...


Best VPN for Binance | Trade securely from anywhere  VPN Compare

Looking to trade securely and access Binance from anywhere? In this guide we've rounded up the top 5 VPN options for use with Binance.


Forex trading – what are the best currencies to trade?  Capital.com

Currencies are priced in other currencies, and all major denominations are quoted in “cross rates” against each other. Traders may choose a fairly predictable ...


Are forex trading signals for you?  ForexLive

What you need to know about signals from UBCFX Foreign exchange or forex is defined as the exchange of a nation's currency for that of another is. Overall, the ...


The Twilight Trading Hour Strikes Currency Markets Again  The Wall Street Journal

There is a fragile spot in the $5.1 trillion currency market: early morning in Asia. This one- to two-hour period when U.S. traders are heading home—but market ...


Is Bitcoin's Increasing Anonymity a Threat to Privacy Coins?  Cointelegraph

Bitcoin's privacy is getting better, but does it pose an existential threat to anonymous cryptocurrencies?


FX Trading - Currency Trading  FXTM

Discover the details of foreign exchange, currency trading, currency pairs, forex market hours, forex trading fundamentals, trading signals and more. | FXTM ...


Collapsed Cryptopia Founder Wants You to Put Funds on His New Exchange  CoinDesk

Because there are, apparently, second acts in crypto, the creator of the defunct Cryptopia exchange is trying again with a new exchange product called ...


Crypto Currency Trading Strategies  Insider Monkey

If you're thinking of trading crypto currencies, you are targeting an instrument that experiences a wide range of conditions. In 2017, crypto currencies...


How to Start a Currency Trading Business  Virtual-Strategy Magazine

Thinking on how to start a currency trading business? Then you are in the right place. Currency trading remains the largest financial market in the world. It's.


Forex trading: Understanding account types and differences  ForexLive

Instaforex: See what different account options are available to FX traders There are a number of different account types available in the FX sphere and this article ...


Currency-Trading Algos “Flummoxed” by Rapid-Fire Brexit Headlines  WOLF STREET

The drama of Brexit with all its arcane details of UK parliamentary procedures and rarely noted characters that suddenly appear prominently on the global stage ...


Shaving Milliseconds Off Currency Trades Could Make Singapore Billions  Bloomberg

Follow Bloomberg on LINE messenger for all the business news and analysis you need. Singapore is grabbing an opportunity measured in milliseconds to win a ...


Japan’s Golden Week could provide opportunities for currency traders, but business as usual for bond investors  MarketWatch

For yen traders, fluctuations in the currency have traditionally been correlated with equity markets and broad economic sentiment. As appetite for assets ...


Brexit is a nightmare for currency traders  CNN

The Brexit deal negotiated by Prime Minister Theresa May will almost certainly be voted down by UK parliament on Tuesday. Currency traders are trying to figure ...


Proper Forex trading plans are never too aggressive  AZ Big Media

Most control must come to risk management. There will be a good trading performance if you can handle the trading performance with that. In this article, we are ...


Meet the 16-year-old London currency trader who has turned £150 into £60,000  MyLondon

With the money he's made he wants to treat his single dad and siblings to a holiday to America.


Europe hits 5 banks with $1.2 billion fine over currency trading cartel  CNN

London (CNN Business) Five global banks have been slapped with a €1.07 billion ($1.2 billion) fine in Europe for running cartels that coordinated currency ...


Forex Trading Tools  Benzinga

FOREX.com is one of the world's largest forex brokers. Account holders get competitive pricing, award-winning customer *service*, actionable data and powerful ...


Currency Traders Should Get Ready for Big Move in the Dollar  Bloomberg

Currency traders should brace for a large move in the dollar, if past periods of low volatility are a guide.


Citi Joins UBS in Setting Up Singapore Currency Trading Hub  Bloomberg

Citigroup Inc. is planning to join UBS AG with an electronic currency trading and pricing platform in Singapore, setting up systems to boost liquidity in Asia's ...


Facebook to Roll Out 'GlobalCoin' Cryptocurrency in 2020: Report  CoinDesk

Social media giant Facebook is set to roll out its own cryptocurrency dubbed “GlobalCoin” in 2020, according to a report from the BBC. The news and ...


Currency trading: Morgan Stanley says delusional investors making mistake  Business Insider

Hans Redeker, the lead global FX strategist for Morgan Stanley, says investors are making a crucial mistake that could end up working against them.


US-China Trade Tensions Impact US Retailer Confidence  MarketPulse

The first half of 2019 was expected to be a boon for U.S. retailers, buoyed by solid consumer sentiment at home and expansion in China – the market many of ...


How to Start a Career as a Forex Trader  NuWire Investor

Making a consistent profit in the forex trading industry is extremely hard – something many newbie investors find out the hard way. Before you dive into a life of ...


UPDATE 1-FX trading volumes slide in April as calmer markets deter investors  Reuters

FX average daily trading volumes down 8.3 pct in April y/y -CLS.


The 9 Best Forex Trading Courses - Forex Trading Training • Benzinga  Benzinga

Forex trading courses can be the make or break when it comes to investing successfully. Read and learn from Benzinga's top training options.


Refinitiv currency trading and data terminals face ‘major incident’  Financial Times

Refinitiv's foreign currency trading platform and financial data terminal both suffered a serious incident on Tuesday, a day after volatility swept across worldwide ...


Best Forex Trading Software  Benzinga

Forex trading is an around the clock market. Benzinga provides the essential research to determine the best trading software for you in 2019.


Best Forex Trading Mobile App  Benzinga

FOREX.com is one of the the largest forex broker for traders. You will get competitive pricing, award-winning customer *service*, and powerful trading platforms to ...


     Large inventory of office cubicle and partitions walls for sale in Northeast Ohio

     Find home remodeling contractors Akron Ohio

Search for estate sales in Akron Ohio

Click here to
OfficeJax free ad space available here improve pagerank with a free one way backlink

 

Find used office equipment in Ohio at www.OfficeJax.Has.It

www.Akron.Has.It

Find the best fleamarkets at www.FleaMarketWorld.Has.It

Find electric powered vehicles at www.NoGas.Drives.It

Flea Market World

Free Automatic Link Exchange

Akron City directory

Find homes for rent
in Akron Ohio
www.homes4rent.has.it

Anonymous and Confidential U.S. Mail Drops - No ID Required reship worldwide

Click here to
post your free classified ad here free advertising and one way backlink
Free one way backlink

 

officejax surplus office furniture outlet Akron, ohio

[Back to Top]

 

auction news and listings for Akron, Ohio

Akron crafts and hobby news center

Akron Ohio pet news

Advertising and promotions Akron, Ohio

The Akron blogging news center

Akron Ohio web site design news

best tips and home remedies

Akron Mortgaging and refinancing

Akron currency trading

Page Ranking Icon

 

Home | Site Map
© 2012 - 2019 All Rights Reserved

 

currency trading forex currency trading online currency trading foreign currency trading currency forex learn online trading currency forex online trading currency day trading currency trading system forex currency trading system currency privateforextrader.com trading currency exchange trading e currency trading currency foreign privateforextrader.com trading book on currency trading currency trading broker currency trading software day trading forex currency currency ireland trading online currency trading system currency future trading day trading for the currency market online foreign currency trading fx currency trading forex currency trading beginner forex training course currency trading currency day system trading currency trading course 4x currency trading currency trading tutorial currency trading information foreign currency exchange trading currency global in market trading started in currency trading commodity  currency trading trading the global currency market international currency trading course in currency trading automated currency system trading foreign currency trading software currency trading strategy currency forex learn trading currency make money trading currency trading signal currency option trading currency forex market trading currency trading made easy chart currency trading currency trading  tip currency foreign forex trading currency demo trading currency trading forex spot rate learn currency trading basics currency trading currency trading for beginner forex currency trading broker currency electronic trading currency game trading currency exchange foreign  forex trading interbank currency trading practice currency trading currency forex fx software software software trading free trading currency guide tool online currency forex trading currency news trading best currency system trading currency trading account currency currency forex forex learn online online trading online currency trading strategy currency trading platform currency forex learn online online trading trading currency trading training company currency exchange foreign trading company currency forex trading currency euro trading currency forex trader trading automated currency trading currency foreign system trading currency market trading currency option trading system currency trading seminar business currency currency home internet trading trading canada currency trading spot currency trading currency exchange rate trading currency forex pair trading using vantagepoint currency network neural trading boards currency forex trading how to start currency trading currency trading australia currency forex tag trading currency forex trade trading currency insurance trading currency trading education live currency trading online currency option trading advisor currency expert trading, commodity currency future trading currency day foreign trading currency exchange link trading credit currency trading