DislikedLocking out, not locking in. I've seen it referred to a few times in VSA material. E.g., in MtM is says:
Page 29, talking about marking up rapidly above the left. If the idea is to punch above resistance into new highs (to prevent weak holders from selling), surely drawing other buyers into the market would be beneficial, unless they're being kept on the sidelines for later. Why?
1) MtM has a psychological emphasis, so possibly the would-be buyers are being kept on the sidelines to encourage emotional buying at higher prices.
2) Preventing...Ignored
Weak holders (people who sold at an lower level and are now locked in) will lose money when they buy.
NEW buyers entering the market will MAKE money when they buy because they will sell at the new higher prices.
So the move is designed to lock in thye weak holders and lock out the new traders.
FYI a trap up move is designed to 'suck in' new traders and get weak holders to add to their position. (weak holders in this instance will be buyrs).
Hope this helps