The idea behind dollar cost averaging is simple. Every month invest a set amount of money into the stock market. When the market is high, you’ll be able to afford fewer shares and when it’s low you’ll be able to buy more shares at a lower price.

Over time, the stock market moves up, your average entry price stays relatively low, and you begin to accumulate a substantial portfolio. Read more »


The uptick rule is a short selling restriction that says you can only short sell a stock on an uptick. In other words, you must wait for a stock to trade a tick higher before you can short it.

This rule was first introduced in 1938 to promote market stability and investor confidence. However, the rule has always had critics and was pulled shortly before the financial crisis in 2007. Read more »


Filling the gap is a popular strategy where you buy a stock when it gaps down in the morning and then wait for it to fill the gap.

Many bloggers have written about how good this strategy is. However, there usually isn’t much evidence to support those claims.

I test the strategy on 20 Nasdaq stocks between 2008-2018 and find mixed results after transaction costs. Read more »