When the first group discovers that housing prices don’t always go up, they will try to dump their properties. And when the second group discovers that interest rates don’t always stay low, many of them will be unable to meet their higher mortgage payments and will likewise try to dump their properties.
两类人的需求都是短期的：当第一类人发现房价并不总是在上涨时，就会抛售房产；而当第二类人发现利率并不会总维持在低水平，而他们无力偿还更高额的按揭贷款时，也同样会试图抛售他们的房产。