I bought a number of two-period bonds such that the value of my purchase exactly equals the proceeds that I get from shorting the one period bond, so I've made a zero wealth transaction.

我买入了一定数量的两年期债券,其成本刚好等于我卖空,一单位一年期债券获得的资金,我做的是零成本交易

耶鲁公开课 - 金融市场课程节选

That is, share repurchase can change the units of measurement in a security and companies have to decide how leveraged the stock will be, which changes the stock price--leverage, meaning how much debt the company takes on.

即 股票的购回会改变,已发行股票的单位数量,公司需要决定,股票的杠杆效用是多少,杠杆会改变股价,杠杆指的是公司举债的多少

耶鲁公开课 - 金融市场课程节选