Answer:
The options are given below:
A) competitively exclude other predators.
B) prey on the community's dominant species.
C) allow immigration of other predators.
D) reduce the number of disruptions in the community.
E) prey only on the least abundant species in the community.
the correct option is B
Explanation:
Keystone species refers to a predator which prevents a particular herbivorous species from wiping out the dominant plant species. If the number of prey are low, the keystone predators can be less abundant and still be effective. Keystone species have a disproportionately large effect on its environment relative to its abundance.
Therefore, by preying on a community's dominant species, keystone predators help to maintain the species diversity in the community, because they ensure that the dominant predators do not totally wipe out the various organisms present in the ecosystem.
An assembly line is an example of mass production
Answer:
a. 54
b. 810 dollars
c. 390 dollars
d. 75 pictures
e. 561.6 dollars and 562.5 dollars
f. 38 pictures
Explanation:
demand per week = 18 pictures
annually this demand = 18 *52 = 936
charge per unit = 60 dollars
order for 6 weeks = 6*18 = 108 quantities
cost of ordering = 45 dollars
cost of holding annually = 15 dollars
a. current average inventory
= (18*6)/2
= 54 pictures
b. current annual holding cost
(108/2)*15
= 810 dollars
c. current annual holding cost
= 936/108 * 45
= 390 dollars
d. size orders to be placed
= 
= 
= 74.9
≈ 75 pictures have to be ordered
e. ordering holding cost per picture
936/75 * 45
= 561.6 dollars
and inventory holding cost per picture
= 75/2 * 15
=562.5 dollars
f. shop inventory per year at optimal ordering quantity
= 75/2
= 37.5
≈ 38 pictures
Answer:
1) When there is only one car dealership in a small town, giving the dealership the ability to influence the price of cars, market failure is due to <u>MARKET POWER.
</u>
2) When a manufacturing plant dumps chemical waste into a nearby river, poisoning the water supply for a small town downstream, market failure is due to <u>EXTERNALITY.</u>
Explanation:
The car dealership has an excessive market power
, which refers to the firms ability to increase the price of its products (cars) above the price of a competitive market.
When the manufacturing plant dumps chemical wastes into the river, it is causing a negative externality on the town's water supply. This means that the town (which is a third party in this case) is suffering from the actions of another party's economic transactions.
Answer: B. Operating income will increase by $ 45,000
Explanation:
Total fixed cost = $833,000
Sale price per unit = 60
Variable cost per unit = 30
Advertising = $30,000
Increase in sales volume = 2500
The contribution margin is the difference between the sales price per unit and the variable cost per unit.
= 60 - 30
= 30
Therefore, Hence the increase in the contribution margin will be:
= ($30 × 2500)=$75000
We then subtract the additional cost of $30,000 from $75,000. This will be:
= $75,000 - $30,000
= $45,000
Therefore, operating income will increase by $45,000
