Consider four survivors on an island. 
Which of the following pairs of survivors has a double-coincidence of wants?
Definitions:
Liberalization
The process of eliminating restrictions and limitations, typically in the context of economic policies to encourage free trade, open markets, and reduced government interventions.
Global Retail Development Index
An annual study that ranks countries based on the attractiveness and potential of their retail markets for investment by retail companies.
Trade Surplus
A situation where a country exports more goods and services than it imports, leading to a positive balance of trade.
Exporting
Producing goods in one country and selling them in another.
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