Some friends and I were having this conversation one random day, and decided to experience this ourselves. For 3 days at our own choosing, we pledged to spend only HK$40 a day (equivalent to around US$5.2). "Why 40 Dollars?" you might ask. Well this is partly inspired by the Hungry for Change campaign organized by Justice Centre Hong Kong, a local NGO advocating for refugee welfare, and 40 dollars is daily food allowance provided to asylum seekers stranded in Hong Kong since they were not allowed to seek employment. (even worse when they were only provided $40 "worth" of food, not $40 in cash - so they don't even have a choice of what to eat)