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:
Interference Fits
A type of fit in mechanical engineering where two parts are so tightly fit together that they deform each other to stay in place.
Locational Transition Fit
A type of fit defined by tolerances that allows for a limited amount of either interference or clearance between assembled parts.
Clearance
The intentional space or gap between two mating parts to ensure there is no unwanted friction or binding during operation.
Interference Fit
A method of fitting two parts together using a dimension in which the size of the hole is smaller than the size of the shaft to be inserted, creating a high-pressure seal.
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