Share your insights or perspective on the financial matter presented in the input.

Why liquidity implies tight spread and low slippage
Consider the case where a stock has low volume.  If the stock normally has a few hundred shares trade each minute and you want to buy 10,000 shares then chances are you'll move the market by driving up the price to find enough sellers so that you can get all those shares.  Similarly, if you sell way more than the typical volume, this can be an issue.