1.A need is something you have to have to survive or complete a task. A want is simply the desire for something, in many cases something to satisfy a need. You need food to survive.
2.In the field of behavioral economics, the term utility refers to the perceived value (i.e., usefulness) an individual receives when they purchase a good or service. There are four different types of utility: form, place, time, and possession utility.
3.We must help to anybody who fell in bad trouble to do our society better/
4.We speak with different people from different countries.Many nations want submarines. Economists say that utility determines 'the relationship between a consumer and a commodity'.
Utility varies between different people and between different nations. A vegetarian does not want meat, but may rate the utility of bananas very highly, while a meat-eater may prefer steak. A mountain-republic like Switzerland has little interest in submarines, while maritime nations rate them highly.
5.The production of pianos falls sharply in wartime.
The utility of a commodity is also related to the quantity which is available to the consumer. If paper is freely available, people will not be so interested in buying too much of it. If there is an excess of paper, the relative demand for paper will go down.
6 и 7 незнаю((.
My favorite hobby is dancing. As far as I can remember, I've always liked to dance. Even when I was little, I always danced, just hearing the music. In kindergarten I really liked to perform at various concerts and festivals. I am often put in the first rows, because I'm a good dancer
In school we also have dance lessons, that is rhythm. Unfortunately, we don't get many, but I like them very much. On the rhythm I teach a variety of dances, polka, Mazurka, cha-cha-cha, Sambo, and, of course, the waltz.
Each dance is very interesting, has its own characteristics, because different dances originated in different countries. For example, polka and Mazurka came from Poland, and the waltz is a traditional Austrian dance. Many dances have come to us from Latin America, which is world famous for its dance festivals and parades