We have (almost) free money
Japan reduced the key rate to 0.1%. This happened only a few days after the US reduced the key rate to a range 0% - 0.25%. This means it is now almost free to borrow money 
Maybe we’ll soon get a premium if we borrow money 
Free money certainly entices everybody to spend more, but what will happen if everybody starts spending money they do not have without loosing anything? What happens to those who want to save money?