Never close a trade, and set your limits sky high!

Just for the record, the failure of Lehman, and the failure of Baring Bros were apples, and oranges.

Baring Bros did fail because of unauthorized trades. Lehman’s failure was lack of liquidity caused by sub-prime mortgage values dropping in 2007. The losses continued in '08 causing investors to pull their money making the problems even worse.

Wich is in summary what most traders do. Overleverage and no risk management wich happened in both cases.