The classic answer is tax the rich. Robin Hood sugested robbing the rich and give to the poor. Jesus sugested that the rich should give to the poor. (something about it being easier for a rich man to go through an eye of a needle than to enter the Kingdom of Heaven). However there is actually no answer! The rich hang on to it!

either decreasing the tax for the poor or increasing the tax for the rich doesn't help......eliminating the monopoly&corruption and converting the billionaires to philanthropist might contribute but it seems not possible...

Share your bread and it tastes better, share your happiness and it becomes bigger.-Phil Bosmans

You'll find no answer to such a question.Great thinkers thought about for centuries but there's no solution as yet. Difference in taxation? Haha..I'm the rich. Do you think I won't find the ways round? ;) Be certain I'll find as like as many, many other congeners of mine. Alas, even socialism of no use as occured, though, I must confess, it still remains my favorite conformation. Money is develish thing and as long as it exists we are doomed.How stupid of your teacher to ask such a question.Shall he ask us , riches, deliberately to give away our money or what?

Just copy the Japanese. They are the most successful at reducing the gap between rich and poor. Other nations include Norway, Sweden, and Germany. Anyway, the question is somewhat politically loaded. The wealth gap in China is because of corrupt officials. So your ESL teacher shouldn't be asking questions like this one. Anyway, part of being rich is the attitude to money. Same with the poor. It is not about moving money per se, but about people's attitudes in general. Give a rich man a million dollars, and he'll invest it. Give a poor man a million dollars, and he'll spend it. See the problem?