This is a quiz on overcalls.
The opponents are bidding - should you dip your toe in the water?
This is an awkward area of the game, with a difficult balancing act. It is good to compete (to mess the opposition about, to attract a good lead, to try and steal the deal).
However, there are risks involved with bidding - one being that you may be sandwiched between two good hands and be socked for zillions.
It is an under-appreciated fact that the biggest penalties at this game come from injudicious overcalls that get Doubled for big fat penalties...