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Brand Dilution

The rage this year seems to be cars colored taxicab-yellow. You see this mostly in high-performance sports cars and SUVs. The other day I saw a minivan in this color, and thought, "there's another vehicle available in yellow" -- until I realized that in fact, it was a taxi.

This made me wonder, are the taxi companies upset at this dilution of their brand? And do the people who own regular cars in this color get hailed mistakenly as taxis?