Refer to the information provided in Figure 3.4 below to answer the question(s) that follow. 
Figure 3.4
-Refer to Figure 3.4. If consumer income increases, the demand for tuna fish sandwiches shifts from D0 to D1. This implies that tuna fish sandwiches are a(n)
Definitions:
Profit-maximizing
The process or strategy of adjusting production and sales to achieve the highest possible profit levels.
Total Cost
The sum of fixed costs and variable costs incurred by a business in producing a good or service.
Output
The quantity of goods or services produced within a given period.
Maximize Profits
The process or strategy aimed at achieving the highest possible profit margins by managing costs and increasing revenue.
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