(It’s called “market making”) It doesn’t necessarily require long term trends to be profitable. It just requires the short term trend to be mean reverting, whi

(It’s called “market making”) It doesn’t necessarily require long term trends to be profitable. It just requires the short term trend to be mean reverting, which is usually the case for markets. Of course, you need a little more sophistication, stop losses and parameter tuning before you can be confident of long term profitability.