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 LAW OF DIMINISHING MARGINAL RETURNS: A principle stating that as more and more of a variable input is combined with a fixed input in short-run production, the marginal product of the variable input eventually declines. This is THE economic principle underlying the analysis of short-run production for a firm. Among a host of other things, it offers an explanation for the upward-sloping market supply curve. How does the law of diminishing marginal returns help us understand supply? The law of supply and the upward-sloping supply curve indicate that a firm needs to receive higher prices to produce and sell larger quantities. Why do they need higher prices?
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 Lesson 22: Factor Supply | Unit 3: Factor Supply Page: 14 of 25

 Topic: Market Control Times Four <=PAGE BACK | PAGE NEXT=>

• Remember the four market structures with varying degrees of control over the supply-side of the market.

• HOWEVER, the demand side is also subject to varying degrees of control.

• The terminology for these very similar to that for supply-side control.

• Monopsony
• Oligopsony
• Monopsonistic Competition
• Perfect Competition

• Market control on the buying side of factors markets need not be related to the degree of market control on the selling side of product markets.

• However, it's not unusual to find comparable market control in both output and input markets.

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ARC ELASTICITY

The average elasticity for discrete changes in two variables. The distinguishing characteristic of arc elasticity is that percentage changes are calculated based on the average of initial and ending values of each variable, rather than initial values. Arc elasticity is generally calculated using the midpoint elasticity formula. The contrast to arc elasticity is point elasticity. For infinitesimally small changes in two variables, arc elasticity is the same as point elasticity.

 GRAY SKITTERY[What's This?] Today, you are likely to spend a great deal of time flipping through the yellow pages looking to buy either a T-shirt commemorating next Thursday or a birthday gift for your uncle. Be on the lookout for jovial bank tellers.Your Complete Scope
 Three-forths of the gold mined each year is used to manufacture jewelry.
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