I would add: 6. Shopping: Sales, promotions, and coupons are all designed to induce more frequent and varied consumption. Pricing for the same item can be wil

I would add: 6. Shopping: Sales, promotions, and coupons are all designed to induce more frequent and varied consumption. Pricing for the same item can be wildly different depending on the store or the day of the week. Attempting to secure the best price is a gamble even after carefully researching your options and making price comparisons.