Years ago, when stocks were quoted in fractions, there was a standard spread of 1/16 of a dollar or a "teenie". This spread allowed scalp traders to buy a stock at the bid and immediately sell at the ask. Hence the teenie presented clear entry and exit levels for scalp traders. The scalp trading game took a turn for the worst when the market converted to the decimal system. The decimal system closed the "teenie" often times to within 1 penny for high volume stocks. This overnight shifted the strategy for scalp traders. A scalp trader now had to rely more on their instincts, level II, and the time and sales window.
By holding overnight, the swing trader incurs the unpredictability of overnight risk such as gaps up or down against the position. By taking on the overnight risk, swing trades are usually done with a smaller position size compared to day trading (assuming the two traders have similarly sized accounts). Day traders typically utilize larger position sizes and may use day trading margin of 25%.
Day trading was once an activity that was exclusive to financial firms and professional speculators. Many day traders are bank or investment firm employees working as specialists in equity investment and fund management. Day trading gained popularity after the deregulation of commissions in the United States in 1975, the advent of electronic trading platforms in the 1990s, and with the stock price volatility during the dot-com bubble.[2]
The bid–ask spread is two sides of the same coin. The spread can be viewed as trading bonuses or costs according to different parties and different strategies. On one hand, traders who do NOT wish to queue their order, instead paying the market price, pay the spreads (costs). On the other hand, traders who wish to queue and wait for execution receive the spreads (bonuses). Some day trading strategies attempt to capture the spread as additional, or even the only, profits for successful trades.[18]
So, swing traders are not looking to hit the home run with a single trade – they are not concerned with the perfect time to buy a stock exactly at its bottom and sell exactly at its top (or vice versa). In a perfect trading environment, they wait for the stock to hit its baseline and confirm its direction before they make their moves. The story gets more complicated when a stronger uptrend or downtrend is at play: the trader may paradoxically go long when the stock dips below its EMA and wait for the stock to go back up in an uptrend, or he or she may short a stock that has stabbed above the EMA and wait for it to drop if the longer trend is down.

Mutual funds are off-limits for intraday trading. The design of these funds is for the long-term investor, and they can only be bought and sold through a broker or the fund's investment company. Also, a mutual fund's price posts only once, at the close of the trading day. This price is known as the net asset value (NAV) and reflects all of the intraday movement of the fund's assets, less its liabilities, calculated on a per-share basis.
Margin account – This type account allows you to borrow money from your broker. This will enable you to bolster your potential profits, but also comes with the risk of greater losses and rules to follow. If you want to start day trading with no minimum this isn’t the option for you. Most brokerage firms will insist you lay down a minimum investment before you can start trading on margin. You can also experience a margin call, where your broker demands a greater deposit to cover potential losses.
Day traders are attuned to events that cause short-term market moves. Trading the news is a popular technique. Scheduled announcements such as economic statistics, corporate earnings or interest rates are subject to market expectations and market psychology. Markets react when those expectations are not met or are exceeded, usually with sudden, significant moves, which can benefit day traders.
A stop-loss order is designed to limit losses on a position in a security. For long positions, a stop loss can be placed below a recent low, or for short positions, above a recent high. It can also be based on volatility. For example, if a stock price is moving about $0.05 a minute, then you may place a stop loss $0.15 away from your entry to give the price some space to fluctuate before it moves in your anticipated direction.