for irrational behaviour and economic theory (gary becker 1962)

What is the main question/behaviour that the paper models? What are the costs and benefits of that behaviour for different agents in the model? What is the conclusion of the model?

Is the paper making any strong assumptions that you disagree with? If yes, what, according to you, will be a more plausible alternative assumption? If there was one thing you could change about the model, what would that be? Will that make the model intractable?