(a) Following immigration, economic welfare calculated including the welfare of immigrants is always greater than economic welfare calculated not including the welfare of the immigrants

(a) Following immigration, economic welfare calculated including the welfare of immigrants is always greater than economic welfare calculated not including the welfare of the immigrants.

(b) For a consumer that consumes two goods and puts Good X on the horizontal axis: If income is $100, the price of Good X is $4/unit, and the price of Good Y is $2/unit, the slope of the indifference curve at the optimum point is -1/2.

(c) When Good X is a normal good, the demand curve for Good X is downward-sloping.

(d) When Good X is an inferior good, an increase in the price of Good X always leads to a decrease in the quantity demanded of Good X.