a)an abundance of resources
As the profit of a certain good starts to decline the good stops being produced.
The point of equilibirum is where price meets supply.
3. Limited resources
As its name stablishes it, scarcity is caused by limited resources to produce some good.
im pretty sure it has something to do with the end of ww1
it was the "4. potsdam" conference that demanded the unconditional surrender of japan, since it was clear that the japanese would continue to find until the very last man otherwise.