In 2007, as market participants began to doubt the quality of collateral backed by mortgage lending, repo rates jumped as lenders hoarded cash.

2007年，由于市场参与者开始怀疑由抵押贷款支持的抵押品的质量，回购利率随着银行囤积现金而飙升。

Meanwhile, m2 grew quickly at the end of last year as people hoarded cash.

与此同时，由于人们囤积现金，m2 在去年底迅速增长。

What happened with this somewhat unpopular denomination is the federal reserve discovered that during the pandemic people started hoarding cash and it's easier to squirrel away, bigger bills.

发生在这种相对不受欢迎的面额上的事情是，美联储发现在新冠疫情期间，人们开始囤积现金，而且更容易藏匿更大面额的钞票。