The theory of demand stated that as the price of the product increased, the lower the demand for that same product in the market, and as the price of the product decreased, the higher the demand. So, in marketing or economics, if the price of a product is high, the number of people purchasing that product will be low, and if the price of that product is low, the number of people buying the product will increase, which is the main reason why people rush to buy things if the price of such things is low.
other economic mindsets are about if there is a fear that soon prices will sky rocket. some will stock up and buy while the prices are low and yet to rise... the problem is its speculation. and when the actual news comes out that the rates wont rise to the fear amount. people then correct/short/re-finance to the new number thats lower then speculated fear
its called FOMO