Invalidation level
What is an invalidation level, and how does it turn a market view into something testable?
In plain words
An invalidation level is the price at which the reasoning behind a trade is judged wrong and the position is closed. It is chosen in advance, usually just beyond a support or resistance level that the view depends on.
Why it matters
It converts a belief into a test with a defined cost. Because the distance from the entry to the invalidation level sets the loss if the view fails, it also determines how large a position can be taken before the potential loss exceeds what the account can absorb.
In a real week: BTC, week of 31 August 2020
In the week of 31 August 2020, BTC opened at 11711.17, rose to 12050.85 on Tuesday, then fell to a low of 9825.00 by Saturday and closed at 10256.20, down 12.42% with a 22.65% range. A view bought at the open would have been invalidated well before that close, and volume was 1.65 times its prior 12-week average.
A common mistake
Choosing the level from how much loss feels tolerable rather than from where the reasoning actually breaks. A level that price can reach without disproving the view only guarantees exit.