MSKL,
1) Referring to either:
a) market is 5 X 5.5, want to sell @ 5.4, hit buy @ 5.4 instead, entry error, get filled between spread but net result is doubled up on position, $400 loss on 10 lot.
b) want to buy 10, buy 100 instead, entry error.
Both examples are the costs of doing...