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The Phillips Curve.

2.How does the exchange rate affect the country's exports and imports?

The simplest and most direct effect is that because imports and exports are settled in US dollars or other international currencies, if the domestic currency appreciates, that is, the income from abroad is converted into the national currency, so the appreciation is not conducive to the export of products and imports, and if the depreciation is the opposite.

Pass by!!! I don't know.

It should be that the sum of ** is equal to MC, because for public goods, the derivation of the aggregate demand curve is different from that of ordinary goods. For the same demand T, the profit is maximized when the sum of the ** that consumers are willing to pay is equal to MC.

1 All are not averages, they are marginal values. Your example is completely wrong, and I can't help you modify your example into a reasonable one. And according to the most general assumptions, k refers to capital, not technology.

In the most primitive mode of production f(l,k), there are only two factors of production: labor and capital. But if you're proficient in multivariate calculus, you'll know that adding more elements makes no difference in essence (so you can certainly add a new technical element).

This formula is easy to derive using calculus, and you can find it in any intermediate or higher economic theory, so I won't repeat it here. The key is that you pay attention to the assumptions and intrinsic implications of the theorem.

There are two key assumptions to this theorem:

1. The scale reward is constant, or in other words, the function q=f(l,k) satisfies the secondality, so that the mathematical derivation can be established;

2. The market is the only one and the most competitive market. Because it is a perfectly competitive market and satisfies the one-price law, the market ** is equal to the marginal output, that is to say, the capital return (interest rate) is MPK, and the labor remuneration (wage) MPL can be established.

Finally, this theorem is also called the product allocation net depletion theorem, why is it called that? This is because the total output of the economy is entirely divided into two elements: labour and capital. q is the total output, mpk is the capital ** (interest rate), and mpk*k is the income of capital in production; Similar MPL*L is what labor earns in production.

Q=MPL*L+MPK*K, output (under fully competitive market conditions) is fully distributed to the two elements of labor and capital, and there is no surplus.

Q: Is there something wrong with the marginal return of mr=9-q?

10,000 units is 100 units, and 80,000 units is 800 hundred units MC1=4+100 4=29

mc8=4+800/4=204

mr1=9-100=-91

mr8=9-800=-791