The poor doesn't add any value in economy what I believe but I don't know any other person way of understanding, so I believe that economy sustainability it depend on entrepreneurs and flows of goods and services that come from other countries and economic productivity of a particular country,  so I have seen any thing or impact that a poor can add for economy support of any country. But government can make employment opportunities available to the poor to manufacture products that will help to increase the economy of the country by using them to work and also pay them a salary that will motivate them to be active to work for the success of balancing economy of a country, except such way no value the poor can add to economy of a country