How to do this question economics, help with economics questions

Calculated using the tabular method, the cash flow statement is prepared as follows:

Year 0 1 2 3 4 5 6

Cash outflow 3000 1500 300 300 0 0 0 Cash inflow 0 0 3000 2000 1500 500 100 Cash flow -3000 -1500 2700 1700 1500 500 100

Accumulated cash flow -3000 -4500 -1800 -100 1400 1900 2000

Net cash flow present value -3000

Accumulated net cash flow present value -3000

Dynamic Investment** Period P't

Number of years in which the present value of the accumulated net cash flow has been positive -1) + Absolute value of the present value of the accumulated net cash flow in the previous year The present value of the net cash flow in the year in which the positive value occurred. years).

Calculate the discounted value of cash outflows and cash inflows.

Discounted value of cash outflow = 3000 + 1500

Discounted value of net cash inflow = (3000-300) "Therefore, the dynamic ** period is 5 years.

It is not easy to answer carefully, and if there is a mistake, please correct it.

Summary. Hello, you're not talking about economics, you're talking about English.

Trouble. Hello, you're not talking about economics, you're talking about English.

Hello, the cover beam is the first to ask the consumer about the preference of the brother. When consumers are more scum-friendly to a certain product, the demand for that product increases. Conversely, when the degree of preference is weakened, the quantity in demand decreases.

Hello, the first question is the travel buried, consumer preferences. When consumers' preference for a certain product increases, the demand for that product increases. Conversely, when the degree of preference is weakened, the quantity in demand decreases.

Question: The price of selling the beef of the master's source pants is 48 a kilogram, selling it for 36 kilograms, and the guests buy two kilograms. The guest couldn't find two hundred, he went to the next door to change two hundred, and the bank found that it was fake, and he lost two hundred next door, how much did he lose?

Use income and expenses to calculate similar topics:

Purchase: Guests buy two kilograms, that is, 4 catties of beef, and buy 4 * 48 = 192 yuan per catty, that is, the expenditure is 192 and -192

The guest gives you 200 (fake money), which means that the income is 200 and +200

You give your neighbor 200 (fake money), which means spending 200 and -200

The neighbor gives you 200 change, which means that the income is 200 and +200

Find money: 200 - 36 * 4 = 56 i.e. spend 56 debit -56

At this point, -192+200-200+200-56 = 48, which means you have lost 48 yuan.

To put it bluntly, the explanation is that if you buy a catty for 48 catties, you will lose 12 yuan for 4 catties and sell 36 catties for a catty, and you will lose 12 yuan for each catty, and you will lose 48 yuan for 4 catties.

Because he found fake money, he gave his neighbor 200 that is, he spent 200 -200

To get here: -192+200-200+200-56-200 = 248, that is, you have lost 248 yuan.

To put it bluntly, the guest bought you 4 catties of beef (cost 4 * 48 = 192) for 0 yuan (because 200 is a fake currency equivalent to 0 yuan), and you also asked him for 56 yuan of leather and real money, so you lost 56 yuan of real money you found and 4 catties of beef, which is 248 yuan.

As for the neighbors. You and he don't owe each other, 200 of the guest's fake money, you give the neighbor, the neighbor gives you 200 real money, and you end up giving him 200 real money, so you don't owe each other, for better understanding.

And one more thing to add, the neighbor gave you back 200 fake money, so you give 200 fake money to the neighbor and he pays you back, and the neighbor gives you 200 real money, and you give it back to him.

So the whole process can be treated as if the neighbor doesn't exist at all.

First of all, it is necessary to solve the production function of the manufacturer, and according to the title, the production function of the manufacturer is:

q = f(l,k) =5lk

Then, you can list the cost function of the manufacturer:

c = 5l + k

Next, we need to solve the combination of (l,k) when the cost is minimal, which can be obtained by solving the first-order condition of the cost function:

c/∂l = 5 = q/∂l = 5k

c/∂k = 1 = q/∂k = 5l

Coupling the above two formulas yields:

5k/5l = k/l =

Bringing into the cost function yields:

c = 5l + k = 5l + l * k l = 6l Therefore, when the cost is the smallest, take l=10, k=50, c=60, so the combination of (l,k) at the smallest cost is (10,50).

If the nonlinear demand curve is concave, then the nonlinear marginal return curve is bisected by the distance between the **axis and the demand curve:

tr=pq=q*f(q)

mr=tr'=f(q)+q*f'(q)

Slope of mr = mr'=2f'(q)+q*f"(q)d=f(q)

Slope of d = f'(q)

then f"(q) <0, so choose c

You can also do this: let the demand curve be p=f(q),f''(q) <0 because the question says that the demand curve is concave. Then tr=pq=qf(q), then mr=f(q)+f'(q)q.

The slope of the demand curve is: f'(q), while the slope of the marginal return is: 2f'(q)+f''(q)。

And f''(q) <0, then you can know that it is on the right. Because the slope of the marginal return is a little smaller than twice the slope of the demand curve, it should be a little to the right in the middle.