If Ann's disposable income increases, her saving decreases

When two nations agree to lower their tariffs against each other, they engage in

a. a customs union b. a free trade union c. geographical specialization d. a reciprocal agreement e. a comparative advantage

What type of CPI bias occurs when consumers switch from buying groceries at their local supermarket to buying them at a discount warehouse like Costco?

a. new outlet b. new product c. quality d. substitution