Sort:  

Hunger. It's sad that there are countries that are deprived of basic need like food. I feel guilty whenever we throw away excess food.

This is a real problem today. Surely we should not waste food if your realize its a huge honor to have something to eat when people elsewhere die of hunger.

inequality about what?

economic inequality

I think in that case there will be many disadvantages. Suppose everyone is equal then one may not work for another. Although there are solutions, It's hard to maintain.

I think by then, reward for work would take on new meaning. And like you said, there will be solutions we may not be able to imagine now.