what is a single economic unit?
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The demise of the "single economic unit" theory (English law)\n\nIt is an axiomatic principle of English company law that a company is an entity separate and distinct from its members, who are only liable to the extent that they have contributed to the company's capital: Salomon v Salomon [1898]. The effect of this rule is that the individual subsidiaries within a conglomerate will be treated as separate entities and the parent cannot be made liable for the subsidiaries debts on insolvency. Furthermore, it can create subsidiaries with inadequate capitalisation and secure loans to the subsidiaries with fixed charges over their assets, despite the fact that this is "not necessarily the most honest way of trading"; see The Coral Rose (No 1.) [1991], per Staughton LJ.\n\nAlthough the secondary literature refers to different means of "lifting" or "piercing" the veil (see Ottolenghi (1959)), judicial dicta supporting the view that the rule in Salomon is subject to exceptions are thin on the ground. Lord Denning MR adumbrated the theory of the "single economic unit" theory in DHN Food Distributors v Tower Hamlets [1976], but this has largely been repudiated. In Woolfson v Strathclyde BC [1976], the House of Lords held that it was a decision to be confined to its facts (the question in DHN had been whether the subsidiary of the plaintiff, the former owning the premises on which the parent carried out its business, could receive compensation for loss of business under a compulsory purchase order notwithstanding that under the rule in Salomon, it was the parent and not the subsidiary that had lost the business). Likewise, in Bank of Tokyo v. Karoon [1987] (PC), Lord Goff, who had agreed with Lord Denning in DHN, held that the legal conception of the corporate structure was entirely distinct from the economic realities.\n\nThe "single economic unit" theory was likewise rejected by the CA in Adams v Cape Industries [1990], where Slade LJ held that cases where the rule in Salomon had been circumvented were merely instances where. The view expressed at first instance by HHJ Southwell QC in Creasey v. Breachwood [1992] that English law "definitely" recognised the principle that the corporate veil could be lifted was described as a heresy by Hobhouse LJ in Ord v Bellhaven [1998], and these doubts were shared by Moritt V-C in Trustor v. Smallbone (No. 3) [2001]: the corporate veil cannot be lifted merely because justice requires it.
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There are none. Tax is a neccessary burden on the economy for government apparatus to function, and does not affect economy, at least positively.
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economic development -  the analysis of the economic progress of nations.
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do you know what a "union" is for? That would be self explanatory.
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At this point, the kilogram is the only fundamental unit that is defined by a physical standard object. There are proposals to redefine in terms of the amount of pure silicon-28 in a sample, no such definition has been agreed to as yet.
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Through the years, there have been a number of approaches to this issue: the first measurements of economic development relied on GDP per capita, expressed in terms of a numerary currency, such as the American dollar; this method of measurement has been all but abandoned by international financial institutions in favor of GDP per capita adjusted by purchasing power parity (PPP). A more holistic approach has been favored by institutions such as the United Nations Development Program, which annually measures the Human Development Index (HDI) for a wide number of nations; the HDI is composed of three variables:\n\n1. GDP per capita, adjusted by PPP\n2. Life expectancy at birth\n3. Literacy proportion\n\nFor more info on GDP calculations and PPP, look them up in a macroeconomics textbook: Dornbusch, Fisher and Startz or Mankiw are good options.
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http://www.freeuniv.com/lect/rankin/Unit2.htm
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Money.  Same as everywhere else.
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PEOPLE, RULES, GOVERNMENT, MONEY, AN ECONOMY, FAMILIES
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based on supply and demand.  Too detailed to explain in a q&a.  If you're in school, take a finance and economics class.
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GDP stands for Gross Domestic Product, which is the total value of all the goods and services of a country.  GDP per capita is simply the GDP of a country divided by its population.  Generally, the higher the GDP, the "richer" the country.  However, a country with a large population may simply be able to produce more than a smaller country and large outliers can skew the per capita measures, meaning you need more information to really understand what these numbers mean.
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A countries economy is it's money system.   It is how much money the government makes, (from taxes and resource collection) and also what that money is spent on (social programs and defense spending ect.).\n\nP.s.-Naveed Zafar Sheikh - see how he said 'simple terms'?  He seems like a student to me, or at least an economic novice.  Nice answer, but terrible at answering in the way the question asks.
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Simple - only one subject, one action, one idea.
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check out here http://en.wikipedia.org/wiki/Planned_economy
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a single yen is a small enough amount of money that a fraction of a yen wouldn't make any sense and therefore doesn't make any cents.  Regaring your other statement, the world is full of all kinds of currency that is basically worthless.  I used to live in a place where we would hire dump trucks to hall the money over to pay the electric bill for our company.
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enterprise is a small form of company having only one owner, while corporation is a big one with more than one owners
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a mixed economy is in reality what most economies are a mixture of private and public companies, capitalism is the concept that is a free market, mainly a private economy where making money is more important that consumer interest,