8.1 The options of the consumer

Consumption bundles with budget depletion
	Quantity Good 1	Quantity Good 2	Expenditures Good 1 (in Euros)	Expenditures Good 2 (in Euro)	Total expenditures (in Euro)
A	667	0	1000	0	1000
B	600	67	900	100	1000
C	533	133	800	200	1000
D	467	200	700	300	1000
E	400	267	600	400	1000
F	333	333	500	500	1000
G	267	400	400	600	1000
H	200	467	300	700	1000
I	133	533	200	800	1000
J	67	600	100	900	1000
K	0	667	0	1000	1000

In the following section the theory of consumer decision will be presented. For this purpose, we assume a representative household that spends its income entirely on the consumption of only two goods. This simplifying assumption allows a more detailed analysis of the theoretical processes behind the consumer’s behavior. In our example these two goods are called Good 1 and Good 2 . Of course, the household cannot consume an unlimited amount of these two goods, because its expenditure is limited by its disposable income. In the above graph, we can vary the income earned by the household and the prices for Good 1 and Good 2 , and observe how this affects different possible combinations of Good 1 and Good 2 . Columns 4 and 5 of the table show how the household divides its income proportionally between the consumption of Good 2 or Good 1 . For example, in row C, 800 of the income is spent on the consumption of Good 1 and 200 of the income on the consumption of Good 2 . The total expenditure always adds up to 100% of the income (1000 at the beginning). Columns 2 and 3 show the amount of each good the consumer gets for the allocated income. This amount depends on the price of the goods. In the case of consumption bundle A, for example, the consumer decides to spend his entire income only on Good 1 . Here, obviously, the quantity that can be consumed increases with increasing income and decreases with increasing price for Good 1 , but does not change with different prices for Good 2 . The goods combination K works analogously. If, on the other hand, he divides his income between both goods – like in the rows between A and K – the consumed bundle of goods depends on the prices of both goods as well as on the disposable income. Which bundle of goods the consumer chooses in the end will be the subject of analysis on the following pages. Looking at the points A to K in the right-hand coordinate system, it can already be presumed that the possible consumption bundles are all on the same straight line for complete budget consumption.