One reason to join is if you have a struggling economy. The EU is a single trade union, and most of the countries in it use one type of note, called a euro. In joining the EU, a country will be able to be helped by A) The booming EU economy and B) The countries helping each other out. A reason someone might not join the EU is they already have a good economy and don't need help.
It started in China made from worms I believe and was considered a luxury item traded in the Indian Ocean trade and Silk Road.
A) - no, we haven't stopped eating meat, even though we do have a surplus of food!
b) - yes, this is true! if there was a surplus of food, not everyone has to produce food and some people can do other tasks! correct answer!
.. so we don't have to look further:)