Rob creates a Product_Details table that has four columns: Product _ID, Product_Name, Category, Price and Discount. A product may have a 10% discount if it is on sale. Which field should Rob assign as a primary key in the table? Rob should assign the field as the primary key in this table. Ok

When the two countries did not specialize, the total production of jeans was 23 million pairs per month, and the total production of corn was 68 million bushels per month. because of specialization, the total production of jeans has increased by million pairs per month, and the total production of corn has increased by million bushels per month. because the two countries produce more jeans and more corn under specialization, each country is able to gain from trade?