Examlex
An entity supertype can have disjoint or overlapping entity subtypes.
Complements
Goods or services that are often used together so that the consumption of one increases the demand for the other.
Inferior Good
A type of good for which demand decreases as the consumer's income increases.
Tuna Fish Sandwiches
A type of sandwich made typically from canned tuna mixed with mayonnaise and other ingredients.
Inferior Goods
Goods for which demand decreases as the income of the consumer increases, inversely related to that of 'normal goods'.
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