In recent years, garbage collection has changed dramatically. Twenty-five years ago a crew of up to 4 or 5 workers and 1 truck collected residential garbage. Now collection is often done by one driver and 1 more fully automated truck. What is an explanation for this change?
◦ Firms and municipalities substituted away from a factor whose price was falling (labour) and toward a factor whose price was rising(capital).
◦ Firms and municipalities substituted away from an increasingly expensive factor (labour) and toward an increasingly inexpensive factor (capital).
◦ The marginal product of labour was falling over time while the marginal product of capital was rising.
◦ Over long periods of time, labour is always replaced by capital.
◦ Over long periods of time, capital is always replaced by labour.
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