noun
buying on margin
Financial term for purchasing securities with borrowed funds, without having the full cash amount.
空買いで株を買うと、値上がりしたときに大きな利益が出る可能性がある。
When you buy stocks on margin, there is a possibility of large profits if the price rises.
空売り means short selling, while 空買い is buying on margin.
Compound of 空 (から, 'empty') and 買い (かい, 'buying'), literally 'empty buying', referring to purchasing without having the actual funds.