Please Answerer these short answer questions,

I have been having some difficulty grasping the concept, thank you!

Which curve shifts and to which direction when a tax is imposed on consumption?If a Prisoner's Dilemma game is repeated an indenite number of times, what has been shown tn be the best strategy? In your own words, briefly explain what a Nash equilibrium represents.\fWrite down a Cobb-Douglas production function exhibiting increasing returns to scale