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.Продажа без покрытия — Википедия

.Short selling is a market procedure, to sell something (stocks, bonds or even houses) that you don't own. For retail account holders, short selling requires...

English expression 'selling something short', short sale, "продажа без покрытия" is perhaps not as useful for vernacular usage. I don't know.

недооценивать => Меня недооцениваете Вы! ??

НЕДООЦЕНИТЬ
=> "Вы меня недооцениваете!"