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Perfect competition is a microeconomic model, to the most common traits of which belong the following: - a large amount of small producers (sellers) of a homogenous product; - a large amount of consumers; - both consumers and producers can not influence the price on their own; - mobility of all resources; - operational costs are zero; - equilibrium price (determined by the intersection of supply and demand curves); - lack of barriers to enter or exit from the market.

Under conditions of perfect competition the price is equal to marginal revenue and, in its turn, marginal revenue is equal to marginal costs. When a company loses money, then it is time to decide whether to continue operating on the market or to shut down. In order to make a right decision it is necessary to analyze total revenue and total costs (fixed and variable). As far as the fixed costs are equal whether the company operates or shut down, variable costs are equal to variable. So if the price per product unit is less than the costs per product unit it means that total revenue (quantity of product multiplied by price) is less than total costs (fixed plus variable) and the company should shut down. Of course, if total revenue is larger than total costs the company should continue operating. When total costs are equal to total revenue it is called the shut down price and it does not matter for company whether to shut down or operate further.

In the long-run companies receive zero economic profit and thus other companies are not interested in entering the market (it means that market participants completely satisfy the demand). But if the demand suddenly increases the prices would increase too and thus new participants would enter the market until the price wont become equilibrium. In practice, perfect competition does not exist as others. This model is abstracts and describes the market in general terms. As the most common example there is used local agriculture sector: there are many producers and consumers, the price is close to equilibrium, there are not enter or exit barriers; but operating costs can not be zero because it takes time, efforts and some costs to sell the product; resources are not absolutely mobile.

I would like to introduce my own example and explain why do I think it is quite suitable one: e-trading. Trading through the Internet is very popular now there are many sellers and consumers, there is no any serious obstacles or barriers to enter or leave the market, if to take more precise example books e-trading than the product becomes quite homogenous, the price level is quite close to equilibrium and producers can not seriously influence it nor can customers, resources are quite mobile (especially information there are plenty of resources in the Internet), transaction cost are quite low (but not zero of course).

If the average price of the product, book in our case, is larger than average variable cost, costs on selling and delivering book in our case, then the company receives profit and it can be said that it operates successfully (in the long run there will occur incentives to enter the market); inside out some companies, most probably, would leave the market and may be try to sell something else.

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Finally, I would like to conclude that perfect competition is quite abstract microeconomic model, which describes market under the certain conditions (which can not be absolutely met in practice, but can be met close enough). But this model gives good economic basis for firms to think in advance about their operational activities or business decisions.

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It's no superhero, and it doesn't have superpowers. But it's being touted by many as the super-answer to unfairly issued speeding and red-light tickets. If you're a driver, and you're disgruntled by photo enforcement, odds are you have already heard of a number plate spray named PhotoBlocker.

What Is PhotoBlocker?
PhotoBlocker is simply aerosol inside a can. It coats license plates with a sheen invisible to humans, but visible to machines. Marketed at $29.99 a can, the number plate spray promises years of road miracles - from helping you elude a red-light ticket to ensuring you are not cited for speeding violations.

The Claim
Naturally, proponents claim that the number plate spray delivers everything it promises. PhotoBlocker is said to have been tested independently by different groups, among them the Denver Police Department, the Dutch Police, Swedish TV, Australian TV, and Fox News. What can PhotoBlocker do? It deflects the light flashed by speed-detection and red-light cameras. This light, in turn, exposes the photos the cameras take, making the license plates captured in the picture unreadable.

What Users Say
Not surprisingly, drivers love number plate sprays. It's easy to see why. PhotoBlocker is cheap, retailing at less than $30 a bottle. Additionally, this number plate spray is easy to apply. While not fool-proof, the directions are so simple it would take a special kind of simpleton to botch things up. The number plate spray may be used on as many as four plates.

Will It Get You Into Trouble?
States have yet to come up with legislation expressly banning PhotoBlocker or products of similar nature and purpose. Understandably, this leaves many drivers and consumers confused. Are number plate sprays like PhotoBlocker illegal? Is it unlawful to coat license plates with PhotoBlocker?

The confusion stems from the fact that while it is illegal in many states to cover license plates, or prevent people from clearly seeing license plates, PhotoBlocker does not exactly prevent people from viewing license plates. Number plate sprays have a thin, white gloss. This finish ensures the license plate remains visible to the human eye. At the same time, it throws back light from photo enforcement cameras.

At present, there is no explicit prohibition against number plate sprays. If you intend to use one, however, it is always a good idea to check in with your local police force for new legislations affecting drivers. Laws evolve along with political climate and changing realities. What may be lawful today may be unlawful tomorrow. It is not impossible for lawmakers to come up with statutes that specifically ban the use of number plate sprays.

If you're considering coating your license plate with number plate spray, remember to see the product as it really is. It's a means to avoid undeserved tickets. It shouldn't be turned into a license to drive recklessly.

Planning to coat your license plate with number plate spray? Read PhotoBlocker reviews and learn more about surveillance cameras on streets when you visit Video-Surveillance-Guide.com today!

Pregnancy in older women is far more prevalent than ever before. More and more women today are waiting until they are more financially and emotionally ready to have children, often in their late 30's or early 40's. In fact, I was one of these statistics. I became pregnant for the first time at the age of thirty nine. And I was having twins. While being older definitely brings increased risks along with it, it also brings increased maturity. I was manic about my diet and fitness. I followed all of my doctor's orders to a tee, and I was constantly reading and researching all the material I could get my hands on. Through all of my experience I have three things I would recommend to all women who have a pregnancy later in life. First, is nutrition.

Eat foods that are high in Folic acid, calcium and iron, and take supplements if needed. And, of course, avoid all of the potentially harmful intakes, like caffeine, alcohol, smoking, etc.. While a woman in her early 20's may be able to "cheat" on these no-nos from time to time with little or no increased risk, those of us approaching 40 need to play it much safer. Next, I would recommend a doctor approved exercise program. Not only did this make feel great physically, but emotionally I think it really helped.

I found myself much more relaxed, and a lot of the anxiety I was having pretty much went away. It really cleared my mind. And last, but certainly not least, is to find other women to talk to. I found a program on-line that a lot of other pregnant women belonged to. There was just something so reassuring about talking to other women my age who were going through the same things I was at the same time I was going through them. Talking to someone who had a child later in life, a couple of years ago, just wasn't the same thing. While she could certainly relate to what I was going through, her anxiety was over with.

She already delivered a healthy baby. But talking with older women who were pregnant at the same time as me, was very reassuring. Well, there you have it. I followed doctor approved diet and exercise programs, and I found a "support group" of women my age going through their pregnancies at the same time I was. The result was a very comfortable, problem free, and for the most part relaxed pregnancy, and just two weeks short of full term I delivered two healthy baby boys. To any women reading this article, who are around my age, and are either pregnant or contemplating becoming pregnant, I have one last piece of advice. Whether this is your first pregnancy or not, it is more than likely your last. Try to relax and enjoy it.

I recently became a first-time mom at the age of 39. I was experiencing a lot of anxiety worrying about my age and the fact that I was having twins. I received all kinds of conflicting advice as to what I should and shouldn't do while pregnant. I finally decided to research for myself. With my doctors consent I followed a program of diet and exercise. Once I started, my anxiety went away, and I had a very comfortable, active and problem free pregnancy. I delivered two very healthy boys, and within just 7 weeks of delivery I was back to my pre-pregnancy weight and even better shape. I've posted my story along with pictures at Pregnant-Healthy.com