Final answer:
The consumer's level of income is calculated by multiplying the price of good Z by the number of units purchased. Given the MRT of -2 and the price of good B, the price of good Z is twice that of good B. With 18 units of good Z purchased at $12 each, the income is $216.
Step-by-step explanation:
Given that the price of good B (PB) is $6, and the client is able to purchase 18 units of good Z without purchasing any units of good B, we must find the implicit price of good Z. Considering the Marginal Rate of Transformation (MRT) is -2, two units of good B can be exchanged for one unit of good Z. This means that the price of good Z (PZ) can be calculated as two times the price of good B, which is $12.
Since the consumer purchases 18 units of good Z, we can calculate the consumer's income (Y) by multiplying the quantity of good Z by the price of good Z (PZ), which gives us Y = 18 units * $12/unit. Therefore, the consumer's income is $216.