Demand refers to how much (quantity) of a product or service is desired by buyers
Supply represents how much the market can offer
There are too many citizens for each of their interests, ideas and opinions to be heard and taken into account one by one. a representative can take the majority vote of the people and refer it back to the higher power.
Biplanes (and triplanes) became (nearly) extinct not because high strength materials (like composites) were not available, but because they became available.
One of the major reasons for use of biplanes in the early days of aviation was that the materials available were of insufficient strength for the (wing) designs used.
The major disadvantage of biplanes (or triplanes) is aerodynamic- it produces a lot of drag compared to the monoplane and the wings interfere with each other.
So, the biplane was an (aerodynamically) inefficient solution to a structural problem. As higher strength materials like Aluminum became widespread, the biplanes fell out of favor.
While they <em>can</em> be revived, I don't see why someone would do that, except for nostalgia (or some special uses, like aerobatics).
There are some companies who manufacture or restore biplanes, but they usually don't use (modern materials like) composites, though modern avionics are used.
The answer would be : food, protection, and prosperity
Food and protection are very essential for all living organism, human included. And as for prosperity, it's the basic human nature as the most intelligent creature on the earth to think in the long term, that's why we seek prosperity
Most of it came from state run farms. The communists collectivized farming meaning that there were no private farms anymore but there were only farms run by the state with agriculture workers working for the country and not just for themselves. Their produce would belong to the state and would be sold to people instead of farmers choosing what to do with it.<span />