المرجع الالكتروني للمعلوماتية
المرجع الألكتروني للمعلوماتية

الرياضيات
عدد المواضيع في هذا القسم 9761 موضوعاً
تاريخ الرياضيات
الرياضيات المتقطعة
الجبر
الهندسة
المعادلات التفاضلية و التكاملية
التحليل
علماء الرياضيات

Untitled Document
أبحث عن شيء أخر
Elision
2024-11-01
Assimilation
2024-11-01
Rhythm
2024-11-01
{ان أولى الناس بإبراهيم للذين اتبعوه}
2024-10-31
{ما كان إبراهيم يهوديا ولا نصرانيا}
2024-10-31
أكان إبراهيم يهوديا او نصرانيا
2024-10-31

الرفق بالحيوان
2-2-2018
معنى كلمة عصا
27-8-2021
لماذا هاجر الحسين (عليه السّلام) من المدينة ؟
24-6-2019
.Why Does Electrophilic Hydration Work?
15-1-2020
الدعوة إلى عدم الاغترار
9-2-2021
انتهاء عقد التامين
17-3-2016

Consumer Data  
  
977   09:25 صباحاً   date: 7-1-2016
Author : Landsbury, Steven E
Book or Source : The Armchair Economist: Economics and Everyday Life
Page and Part : ...


Read More
Date: 5-1-2016 802
Date: 7-1-2016 924
Date: 23-2-2022 514

Consumers in the United States purchase between 5.5 and 6 trillion dollars worth of goods and services annually, making the U.S. economy by far the largest in the world. This economy is sometimes called a “free market” economy because, for the most part, the goods and services produced and the prices charged for those goods and services are determined by what consumers want and how much they are willing to pay for it. Except in rare cases of regulated industries, the government does not dictate to producers how much of a product they can make or how much they may charge for the product. Using sophisticated research methodologies, industries determine the consumer demand for a given product and at what price they may sell that product to make the largest possible profit. Marketing experts then develop advertising campaigns to convince consumers to buy their company’s product rather than the competition’s. If two or more companies offer similar products of equal quality, consumers may make their buying decisions based upon the more appealing advertising campaign or upon which product is priced lower.

How Can Consumers Learn More About Products?

In an economy driven by consumer demand for goods and services, it is important for those consumers to have access to data that will assist them in making purchasing decisions. In the United States, numerous organizations have been formed to provide consumers with information about the quality and pricing of commodities and services offered by businesses. Consumers Union is a non-profit organization that publishes Consumer Reports,  a monthly magazine that reports the results of testing done on various types of products, ranging from food items to electronic equipment to automobiles. The magazine articles rate the tested products on the basis of quality, price, and value. To decrease the possibility of bias in the magazine, Consumer Reports does not accept any advertising. Thus, its writers and editors are not influenced in their reporting to be less critical of a product simply because its producer pays the magazine huge amounts in advertising dollars. In addition to nonprofit groups such as Consumers Union, there are also a number of for-profit organizations that issue ratings of consumer goods and services. One of the largest, J. D. Powers and Associates of Agora Hills, California, does scientific surveys of consumers to determine their level of satisfaction with the products they use. When a company’s product comes in at or near the top of a Powers survey, it will frequently tout this fact in their future advertising.

Understanding Unit Pricing

With so many sources of data available, it might seem that the American consumer should be able to make selections easily in the marketplace, but the fact that so many companies are vying for the consumer dollar can lead to a dizzying array of choices for the consumer to make. Most companies are not satisfied to market or price a given product in only one way. In addition to regular grocery stores, for example, there have arisen so-called convenience stores located near almost any neighborhood to make it easy for people to make a quick drive or walk to pick up one or two items of immediate need. There is a price for this convenience, however. A gallon of milk or a loaf of bread is typically more expensive at the convenience store than at the larger grocery stores. At the other end of the scale, there are huge “warehouse” stores that typically sell items in bulk at lower unit prices than the traditional grocery stores. Thus the idea of unit pricing is an important concept for consumers to understand.

The unit price for a product might be expressed, for example, in price per ounce. Thus a 16-ounce loaf of bread priced at $2.40 would have a unit price of $2.40/16oz., which equals 15 cents per ounce. Now suppose that the same store has a 24-ounce loaf of the same brand of bread for $3.20.

Which should the consumer buy? Based on unit price alone, the 24-ounce loaf is less expensive, since $3.20/24oz is only about 13 cents per ounce. On the other hand, suppose that this consumer cannot eat more than 16 ounces of bread in a week and that after a week the remaining bread has started to become stale and must be thrown away. Then the consumer has actually paid $3.20 for 16 ounces, which comes to 20 cents per ounce. Clearly, if one buys something in large quantities at a lower price per unit, it is only a bargain if the product will remain usable to the consumer over a longer period of time. Thus, buying light bulbs or canned foods in bulk makes sense if the unit price is lower than for smaller quantities, because light bulbs and canned food can be stored for long periods of time.

Another example is long-distance minutes. Mobile phone companies typically sell minutes of calling time in various quantities, usually at a lower  “per minute” price for, say, 300 minutes per month than for 100 minutes per month. However, if the consumer seldom talks more than 100 minutes per month, the consumer is, in effect, throwing away the remaining 200 minutes, just like the grocery shopper throws away unused bread. The actual unit price per minute is then likely to be larger than the stated unit price. In such cases, the consumer is helped by knowing some simple consumer math, but must also be aware that mathematics applied in the absence of common sense can do more harm than good. 

______________________________________________________________________________________________

Reference

Landsbury, Steven E. The Armchair Economist: Economics and Everyday Life. New York: The Free Press, 1993.

 




الجبر أحد الفروع الرئيسية في الرياضيات، حيث إن التمكن من الرياضيات يعتمد على الفهم السليم للجبر. ويستخدم المهندسون والعلماء الجبر يومياً، وتعول المشاريع التجارية والصناعية على الجبر لحل الكثير من المعضلات التي تتعرض لها. ونظراً لأهمية الجبر في الحياة العصرية فإنه يدرّس في المدارس والجامعات في جميع أنحاء العالم. ويُعجب الكثير من الدارسين للجبر بقدرته وفائدته الكبيرتين، إذ باستخدام الجبر يمكن للمرء أن يحل كثيرًا من المسائل التي يتعذر حلها باستخدام الحساب فقط.وجاء اسمه من كتاب عالم الرياضيات والفلك والرحالة محمد بن موسى الخورازمي.


يعتبر علم المثلثات Trigonometry علماً عربياً ، فرياضيو العرب فضلوا علم المثلثات عن علم الفلك كأنهما علمين متداخلين ، ونظموه تنظيماً فيه لكثير من الدقة ، وقد كان اليونان يستعملون وتر CORDE ضعف القوسي قياس الزوايا ، فاستعاض رياضيو العرب عن الوتر بالجيب SINUS فأنت هذه الاستعاضة إلى تسهيل كثير من الاعمال الرياضية.

تعتبر المعادلات التفاضلية خير وسيلة لوصف معظم المـسائل الهندسـية والرياضـية والعلمية على حد سواء، إذ يتضح ذلك جليا في وصف عمليات انتقال الحرارة، جريان الموائـع، الحركة الموجية، الدوائر الإلكترونية فضلاً عن استخدامها في مسائل الهياكل الإنشائية والوصف الرياضي للتفاعلات الكيميائية.
ففي في الرياضيات, يطلق اسم المعادلات التفاضلية على المعادلات التي تحوي مشتقات و تفاضلات لبعض الدوال الرياضية و تظهر فيها بشكل متغيرات المعادلة . و يكون الهدف من حل هذه المعادلات هو إيجاد هذه الدوال الرياضية التي تحقق مشتقات هذه المعادلات.