Recently I do some research about pushcart stalls in shopping mall. Pushcart stalls are quite in recent years mainly because of its cheaper rental than permanent stores. It gives entrepreneur an opportunity to start their business easily. Some people argued that these stalls increase the competition level in the shopping mall thus the revenue of permanent stores have decreased. After observation I found in most cases stalls sell some volume products which are quite different from the products those permanent stores sell. It doesn't form competition usually.