Changing value propositions in today's economy have caused marketers to learn a tough lesson about customers. What is that lesson?

Customers will turn to the most convenient, least expensive alternative in situations where they see goods and services as commodities.

Customers will always seek the best value regardless of quality.

Customers will always turn to the most recognized brand.

Customers will always respond favorably to advertising for premium products.

Customers will always seek the best quality regardless of price.