Answer: Self esteem is an example of a CONSTRUCT
Explanation: A construct in Philosophy is a perfect, flawless, optimal object, where the existence of the said object may be in an individual's mind.
In essence, construct does not necessarily exist in reality but are ideal situations.
This is the situation in which Bill is in, wanting to boost his self esteem (construct) he buys expensive things. Self esteem is a CONSTRUCT because the idea exists in the mind of an individual. Which is what CONSTRUCT is about, ideal situations that are not necessarily existent.