“…Sellers want money and sell their assets to buyers, while buyers bring money or liquidity into the market (Dijk, Geltner, & Minne, 2018). The relative movement of sellers' and buyers' reservation prices over time shows the transaction volume or liquidity (Fisher et al, 2003;Genesove, 2012;Zheng, Chau, & Eddie, 2015;Gong, Zhang, & Zhao, 2018). Specifically, in upward market period the increase of sellers' and buyers' reservation prices drives the increase of the transaction price, while the greater increase of buyers' reservation price than that of buyers leads to more trading or liquidity; Similarly, in downward market the decrease of sellers' and buyers' reservation prices reduces the transaction price, while the greater decrease of buyers' reservation price than that of sellers results in less trading or liquidity (Gong et al, 2018).…”