A large share of the world supply of diamonds comes from Russia and South Africa. Suppose that the marginal cost of mining diamonds is constant at $3,000 per diamond, and the demand for diamonds is described by the following schedule:

Price	Quantity
(Dollars)	(Diamonds)
8,000	3,000
7,000	4,000
6,000	5,000
5,000	6,000
4,000	7,000
3,000	8,000
2,000	9,000
1,000	10,000

If there were many suppliers of diamonds, the price would be ________ per diamond and the quantity sold would be _______ diamonds.

If there were only one supplier of diamonds, the price would be __________ per diamond and the quantity sold would be ________ diamonds.

Suppose Russia and South Africa form a cartel.

In this case, the price would be ________ per diamond and the total quantity sold would be ________ diamonds. If the countries split the market evenly, South Africa would produce __________ diamonds and earn a profit of.

If South Africa increased its production by 1,000 diamonds while Russia stuck to the cartel agreement, South Africa's profit would [decrease/increase] to $___________.

Why are cartel agreements often not successful?

A) All parties would make more money if everyone increased production.

B) One party has an incentive to cheat to make more profit.

C) Different firms experience different costs.

An economy consists of two regions, the North and the South. The short-run elasticity of labor demand in each region is -0.5. Labor supply is perfectly inelastic within both regions. The labor market is initially in an economywide equilibrium, with 600,000 people employed in the North and 400,000 people in the South at wage of $15 per hour. Suddenly, 20,000 people immigrate from abroad and initially settle in the South. They possessed the same skills as the native residents and also supply their labor inelastically.

(a) What will be the effect of this immigration on wages in each of the regions in the short run (before any migration between the North and the South occurs)?

(b) Suppose 1,000 native-born persons per year migrate from the South to the North in response to every dollar differential in the hourly wage between the two regions. What will be the ratio of wages in the two regions after the first-year native labor responds to the entry of the immigrants?

(c) What will be the effect of this immigration on wages and employment in each of region in the long-run (after native workers respond by moving across regions to take advantage of whatever wage differentials may exist)? What are the equilibrium levels of employment and wage in both regions? Assume labor demand does not change in either region.

Pringle et al (2015) experimentally examined the effects of fire and herbivory by elephants on the density of geckos that live in trees in Kenya, using 4 ha study plots. They excluded elephants from half of the plots and left the other half unfenced. Then they burned the vegetation in half of the plots and left the other half unburned (see sketch below). Each treatment was replicated once in three different areas used as blocks: Central, North and South. Four months after the treatments were applied, the researchers estimated the density of the gecko species Lygodactylus keniensis in each plot (number of individuals / m2 ).

Block	Elephant Treatment		Fire Treatment	July 2013 lizard density per ha
Central	Elephants present		Burned	853.33
Central	Elephants present		Unburned	183.33
Central	No elephants		Burned	270
Central	No elephants		Unburned	256.67
North	Elephants present		Burned	784.44
North	Elephants present		Unburned	298.89
North	No elephants		Burned	417.78
North	No elephants		Unburned	212.22
South	Elephants present		Burned	661.11
South	Elephants present		Unburned	356.67
South	No elephants		Burned	380
South	No elephants		Unburned	388.89

Using R, calculate the standard deviations of the four treatments

list the stages of Illness and explain in 350 words

explain capital budgeting in 300-350 words.

What are the different roles played by microorganisms in our world? Give examples to illustrate your answer. Find at least two of your examples by referring to any two recent articles on microorganisms, whether from a newspaper, magazine or Internet.

If you spill some water on the kitchen floor, it's obviously very slippery. Yet when you want to turn the pages over in a magazine, you put some water on your hands and it becomes really easy to grip!

Alert Security Services Co. offers security services to business clients.

Based on the end-of-period spreadsheet, prepare the closing entries for Alert Security Services Co.

Alert Security Services Co.

End-of-Period Spreadsheet

For the Year Ended October 31, 2018

1		Adjusted	Adjusted
2		Trial Balance	Trial Balance	Income Statement	Income Statement	Balance Sheet	Balance Sheet
3		Debit	Credit	Debit	Credit	Debit	Credit
4	Cash	13.00
5	Accounts Receivable	108.00
6	Supplies	8.00
7	Prepaid Insurance	2.00
8	Land	184.00
9	Equipment	50.00
10	Accumulated Depreciation-Equipment		7.00
11	Accounts Payable		34.00
12	Wages Payable		2.00
13	Common Stock		50.00
14	Retained Earnings		196.00
15	Dividends	6.00
16	Fees Earned		227.00
17	Wages Expense	108.00
18	Rent Expense	15.00
19	Insurance Expense	8.00
20	Utilities Expense	7.00
21	Supplies Expense	2.00
22	Depreciation Expense	2.00
23	Miscellaneous Expense	2.00
24		$516.00	$516.00
25	Net income (loss)

CHART OF ACCOUNTS
Alert Security Services Co.
General Ledger
ASSETS 11 Cash 12 Accounts Receivable 13 Supplies 14 Prepaid Insurance 15 Land 17 Equipment 18 Accumulated Depreciation-Equipment LIABILITIES 21 Accounts Payable 22 Wages Payable EQUITY 31 Common Stock 32 Retained Earnings 33 Dividends 34 Income Summary	REVENUE 41 Fees Earned EXPENSES 51 Wages Expense 52 Rent Expense 53 Insurance Expense 54 Utilities Expense 55 Supplies Expense 56 Depreciation Expense 57 Miscellaneous Expense

Question 6 (Mandatory) (1 point)

Which increase in antibody titer (dilution) best indicates an acute infection?

Question 6 options:

	from 1:2 to 1:8
	from 1:4 to 1:16
	from 1:4 to 1:256
	from 1:64 to 1:128

Question 7 (Mandatory) (1 point)

Fred tests positive for anti-HBsAG, and his test for HBeAg was previously positive but is now negative. This indicates that he is:

Question 7 options:

	a chronic carrier
	acutely infected
	in recovery with good prognosis
	co-infected with delta hepatitis

Question 8 (Mandatory) (1 point)

Hepatitis B virus can be transmitted by:

Question 8 options:

	acupuncture
	tattoos
	sexual contact
	all of the above

Question 9 (Mandatory) (1 point)

Viral capsid antigen of Estein-Barr virus:

Question 9 options:

	is found only in a few of the people who are infected
	causes the production of an IgM antibody early in the infection
	causes the production of abnormal macrophages
	is not on Epstein-Barr virus

Question 10 (Mandatory) (1 point)

Which of the following positive antibody tests may be an indication of recent vaccination or early primary infection for rubella in a patient with no clinical symptoms?

Question 10 options:

	Only IgG antibodies positive
	Only IgM antibodies positive
	Both IgG and IgM antibodies positive
	Four fold rise in titer for IgG antibodies