Opportunity cost occurs because of a producer's need to limit resources.
protect resources.
allocate resources.
spend resources.

In a highly publicized event in May–June 1939, the United States refused to admit over 900 Jewish refugees who had sailed from Hamburg, Germany, on the St. Louis. The St. Louis appeared off the coast of Florida shortly after Cuban authorities cancelled the refugees' transit visas and denied entry to most of the passengers, who were still waiting to receive visas to enter the United States. Denied permission to land in the United States, the ship was forced to return to Europe.

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