to $1 and the price of burgers rises from $2 to $4. Why is the

Please answer each question separately 1. Explain  why scarcity leads to tradeoffs? 2. What are diminishing marginal returns? 3. Suppose Alphonso’s town raises the price of bus tickets from $0.50 to $1 and the price of burgers rises from $2 to $4. Why is the opportunity cost of bus tickets unchanged?