在宏观经济学的教材中看到这句话“the supply of financial assets decreases when expected returns (Y TM) increase (due to higher borrowing costs) and increases when prices increase". 我对其中金融资产的供应与预期收益成反比（因为较高的借贷成本）无法理解，请大家可以帮我理解一下，谢谢！