Most products we buy go through a lengthy series of intermediate steps before they are available for us to purchase. For this problem, say we are tracing the stages, and the associated transaction values, involved in the production of a hypothetical tin of coffee: Stage Value Factory buys beans from farmers 2 Factory buys tin box 1 Factory sells tins of coffee to wholesaler 8 Wholesaler sells to retail chain 11 Retail chain starts a marketing campaign 1 Retail chain sells to public 15 Calculate the addition to GDP contributed by this tin of coffee, using the following: Expenditure-based accounting a. b. Income-based accounting C. Production-based accounting,