Answer each question clearly, logically, and concisely

4. What are the 3 different types of investment spending counted in GDP? 5. What are three characteristics that make specialization an effective way for workers to increase their productivity? 6. Mary can make 3 strawberry pies or 3 apple pies in an hour. Steve can make 5 strawberry pies or 10 apple pies in an hour. According to economic reasoning, who should specialize in making strawberry pies? Explain