Why does a record-breaking result usually get worse next time?

An extreme result is partly luck, and luck does not show up twice in a row.

When a measurement is unusually high or low, part of that extreme came from random chance on top of the true average. Chance does not repeat, so the next measurement tends to land closer to normal - all by itself, with no cause behind it. The danger is that we credit whatever we did in between for a shift that was going to happen anyway.

Your salesperson has a freak 200 million VND month, you do nothing different, and next month she is back to 90 million. She did not slack off - she was just never really a 200 million person.

After an extreme high or low, expect a move back toward average even if nothing changed - do not hand the credit or blame to your last action.

It stops you from trusting a remedy that only looked like it worked because things were going to bounce back anyway.

Extreme today, average tomorrow - luck does not RSVP twice.

Learn the idea and practice English at the same time.