This combination of factors has made day trading in stocks and stock derivatives (such as ETFs) possible. The low commission rates allow an individual or small firm to make a large number of trades during a single day. The liquidity and small spreads provided by ECNs allow an individual to make near-instantaneous trades and to get favorable pricing.
Scalping in this sense is the practice of purchasing a security for one's own account shortly before recommending that security for long-term investment and then immediately selling the security at a profit upon the rise in the market price following the recommendation.[5] The Supreme Court of the United States has ruled that scalping by an investment adviser operates as a fraud or deceit upon any client or prospective client and is a violation of the Investment Advisers Act of 1940.[6] The prohibition on scalping has been applied against persons who are not registered investment advisers, and it has been ruled that scalping is also a violation of Rule 10b-5 under the Securities Exchange Act of 1934 if the scalper has a relationship of trust and confidence with the persons to whom the recommendation is made.[7] The Securities and Exchange Commission has stated that it is committed to stamping out scalping schemes.[8]
Assess how much capital you're willing to risk on each trade. Many successful day traders risk less than 1% to 2% of their account per trade. If you have a $40,000 trading account and are willing to risk 0.5% of your capital on each trade, your maximum loss per trade is $200 (0.005 x $40,000). Set aside a surplus amount of funds you can trade with and you're prepared to lose. Remember, it may or may not happen.