This poem is relevant today. In rich or wealthy countries, food is not hard to get. Therefore the food that isn’t needed is discarded while the poorer countries have nothing to feed themselves with. Those people stave to death.
A lower volatility means that a security's value does not fluctuate dramatically, but changes in value at a steady pace over a period of time. One measure of the relative volatility of a particular stock to the market is its beta.
B - he believed that people already possessed knowledge of truth
t - a new way of questioning, self-teaching
c - the knowledge of his students