The Observed Change in the Reserves of Copper, Lead, and Zinc

question 43

Multiple Choice

The observed change in the reserves of copper, lead, and zinc between 1960 and 1990 was most likely caused by

• A)low prices discouraging exploration for new reserves.
• B)a slowdown in demand growth.
• C)high prices that stimulated exploration.
• D)the discovery of substitutes.

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