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The question provided is about an aggregate consumption function given by \( C = 100 + 0.8Y \), where \( C \) is the aggregate consumption and \( Y \) is the national income. Let's go through each part of the question step by step:

### a. Interpret the coefficients 100 and 0.8 in the consumption function
- **100** represents **autonomous consumption**, which is the level of consumption when national income \( Y = 0 \). Even if there is no income, consumption still occurs due to basic needs.
- **0.8** represents the **marginal propensity to consume (MPC)**, which indicates the proportion of additional income that will be spent on consumption. Here, for every additional unit of income \( Y \), 80% (or 0.8) is spent on consumption.

### b. If national income is 1000, what is the aggregate consumption?
We use the function \( C = 100 + 0.8Y \) to calculate consumption when \( Y = 1000 \).

\[
C = 100 + 0.8(1000)
\]
\[
C = 100 + 800 = 900
\]

So, the aggregate consumption is **900** when national income is 1000.

### c. Draw the consumption curve
The consumption function is a linear equation \( C = 100 + 0.8Y \), where the slope is 0.8 and the intercept is 100. This means the graph is a straight line starting at \( C = 100 \) when \( Y = 0 \), and increasing with a slope of 0.8 as \( Y \) increases.

Would you like me to draw the consumption curve for you? Let me know if you have any questions about this solution or need more details.

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Here are 5 related questions to expand the discussion:
1. What does it mean if the marginal propensity to consume (MPC) is greater than 1?
2. How would the aggregate consumption change if the marginal propensity to consume was reduced to 0.5?
3. What is the saving function corresponding to this consumption function?
4. How would changes in national income impact aggregate consumption over the long run?
5. How would the graph of this function change if autonomous consumption increased to 150?

**Tip:** The marginal propensity to consume (MPC) is crucial for understanding how changes in income affect consumer behavior. Keep in mind that \( MPC + MPS = 1 \), where MPS is the marginal propensity to save.

Sebuah negara memiliki fungsi konsumsi agregat C = 100 + 0,8Y, di mana C adalah konsumsi agregat dan Y adalah pendapatan nasional.
a. Interpretasikan koefisien 100 dan 0,8 dalam fungsi konsumsi tersebut!
b. Jika pendapatan nasional sebesar 1000, berapakah konsumsi agregat?
c. Gambarkan Kurva Konsumsinya!

Learn how to interpret and calculate the aggregate consumption function C = 100 + 0.8Y. This problem covers economic and mathematical concepts such as linear functions and the marginal propensity to consume (MPC). Suitable for students in Grades 11-12.

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