In: Economics
1) Budget line is the locus of all bundles of good X and Good Y which can be purchased with given income M and prices Px and Py, such that the expenditure of each of the possible combinations is equal to the total money income of the consumer. . If the price of good X is Px and price of good Y is Py, then equation of the budget line is given by :
Px*x+ Py*y = M where, Px: Price of good X, Py: Price of Good Y, x: Units of good X consumed, y: Units of good Y consumed, M: Income of the consumer
Given: Px = $4 and Py= $2, M = $20
Budget Equation: 4x +2y = 20
two bundles that are affordable and have the same total expenditure:
If x= 2, => 4*2 + 2y = 20 => 8 +2y = 20
2y = 20-8 = 12 => y=12/2 = 6
First bundle: (x,y) = (2,6)
If x= 4, => 4*4 + 2y = 20 => 16 +2y = 20
2y = 20-16 = 4 => y=4/2 = 2
Second bundle: (x,y) = (4,2)