Homeowners will feel more comfortable and they may feel ready to trade up.私房主会感到更安心，可能愿意变卖旧房购买更贵的房子。He wanted to trade up to a newer car.他想将旧车折价贴换较新的车。The homeowner wants to trade up.房主想要把旧房作价贴换一幢较好的房子。It also encourages existing home owners to trade up to larger accommodation.这还可以鼓励现有的房主置换更大的住所。