A time-weighted average price is the average of an asset's price over a window, weighting each observation by how long it stood. Because it averages across time rather than taking a single instant, a TWAP is far harder to move with one trade than a spot print is.
That manipulation resistance is why settlement systems prefer a TWAP to a last-trade price. Moving a 60-second average requires sustaining a price for a meaningful part of that minute, not landing one print at the right moment.
The trade-off is lag: a TWAP is by construction behind the current spot price, and the size of that gap is itself a tradeable signal near a cycle close.
Assuming a TWAP tracks spot closely enough to substitute for it. It usually does, and then it does not exactly when it matters: the last minute before a short-cycle market closes.
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