Exactly, only you know what your threshold is."minimum threshold that prevents cronic unhappiness" means different things to different people.
Warren Buffett would be happy if his net worth is only a few millions instead of billions since he lives in the same house since 1958, drives an American car, eats at McDonald and drinks cherry coke.
For me, it means financial freedom: freedom from worry about put food on the table, freedom to choose where I want to live, how I want to live and finally, freedom from worry about income.