Describe how poor people are able to earn a living using gambling and informal trade as a strategy

Gambling gives the largest sum of reward with little amount of initial capital, but it possesses the highest risk in term of return.

Poor people could use this as a one way ticket to wealth, but they need to put luck into consideration, so it's not really reliable.

Informal trade is more reliable compared to gambling, but it could be somewhat illegal or unethical.

In informal trade, the people could avoid paying taxes and receive the profit in larger sum.