If everyone in the world based all of their purchase decisions purely on price:

DRINK CATEGORY
1. RC Cola would be in the majority of soda dispensers
2. My father switches his COORS beer for a Pabst Blue Ribbon

BEAUTY CATEGORY
1. 2 in 1 Shampoo and Conditioner is found in most showers
2. People realize shaving products such as wild berry scented shaving gel are unnecessary

CAR CATEGORY
1. The Kia Sephia makes its big comeback
2. The Geo Metro gets re introduced as Kia Sephia's main competition

TECHNOLOGY
1. Acer laptops would be the most requested graduation gift
2. Dial up internet is still slow but now worth it

FOOD
1. Ramen outsells Barilla
2. Jello gelatin becomes America's most popular desert again

PETS
1. Beta fish are more popular than buying a puppy
2. Chia pets become a good substitute for a real pet

IN THIS TYPE OF WORLD:
Products would be the brand itself and the brand names are irrelevant and forgettable
Example: "You have to go check out those neon flip flops they have at the dollar tree."

FORTUNATELY:
People will always desire and feel the need to purchase "the good things in life"