The quality or state of being arranged into different types or varieties.
From 'assorted' (past participle of 'assort') plus '-ness' (quality of). This is a modern formation creating an abstract noun from the adjective.
The 'assortedness' of candy in a box or vegetables at a farmer's market represents consumer choice—something that seems normal now but was actually a luxury innovation that only became standard in the last 100 years.
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