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 falls, the demand for tuna fish sandwiches shifts from D0 to D1. This implies that tuna fish sandwiches are a(n)
Definitions:
Performance
The level of accomplishment of a given task measured against preset known standards of accuracy, completeness, cost, and speed.
Aggregation
The process of combining multiple pieces of data or information into a single group or summary value.
Performance-Based Pay
A compensation system where an employee's pay is based on performance or the achievement of specific targets.
Merit Pay
A raise in salary based on an employee's performance, rewarding those who meet or exceed specified work standards.
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