Buy low, sell high

More like borrow + sell when high, buy + return when low. Doesn't flow off the tongue as well though, have to admit.

Or more importantly in this case: sell high, buy low

Writing option contracts and shorting the market are two examples which come to mind.

Let’s say you had an algorithm that predicted when a recession was declared on average (this is important) 2 months earlier than when it was technically acknowledged (what this algorithm purports to do).

What series of orders would you put in & where to take advantage of it? What market conditions would make money for those orders?