Mrs Friedman is an economist in her own right, and confides that she completed a draft of a paper on capital theory on her honeymoon with Milton.
Chile's experience suggests that even if they were desirable in theory, capital controls may be difficult to enforce in practice.
In theory, capital will shimmy efficiently over to meet labor.
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That raises a further question - whether the government will have to revert to awarding eight-year franchises, rather than 15-year franchises, because in theory the capital required to underpin an eight-year contract should be much less.
Had they paid out less, capital appreciation would, in theory, have been commensurately higher.
Doesn't classic academic theory say that capital stucture is irrelevant in the long run?
Lief was sold but figured he couldn't get venture capital to fund this unproved theory.
Though in theory returns on capital should be much higher in the developing world, where economies remain labour-intensive, in practice the story is more complicated.
However, argues Svetlana Tsalik of the Open Society, a group financed by George Soros, a well-known investor and philanthropist, these funds can help to sterilise capital inflows and (in theory) to save for a rainy day.
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Guided by a radical theory know as Capital Export Neutrality, the OECD wants to impose global tax rules that would prevent taxpayers from ever having the ability to benefit from better tax law in other jurisdictions.
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An EU 7% capital ratio maximum would also in theory prevent the chancellor imposing a 10% minimum on British retail banks, which has been recommended by the Independent Commission on Banking and has been broadly endorsed by Mr Osborne.
Moreover the financial institutions that in theory should have supplied that capital were the cause of the collapse.
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But his shares do not deserve a huge premium on the theory that he can keep pulling capital gains out of the hat.
In theory, the new Basel III capital rules should be good news for bond investors since they will make banks safer, reducing the probability of default.
Developed economies have lots of skilled workers, whereas emerging economies have lots of low-skilled ones, so according to the theory advanced countries will specialise in capital-intensive products requiring skilled labour and emerging economies in low-tech products.
Many believe capital deployment should follow a "pecking-order theory" that prescribes that managements should apply their cash flow, in order of priority, to fix their balance sheet if overleveraged, fund organic investments, pay dividends, fund acquisitive growth and, only when there is additional cash left over, to distribute it via share repurchases.
Moving the capital would reduce delays and hence costs in theory.
The theory: The riskier the assets, the more capital financial institutions should have for a cushion.
The additional capital requirements in combination with enhanced risk management standards, in theory should lead to reduced risk of bank failures, and should decrease the interdependence between financial institutions, effectively reducing the risk of future banking crises.
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Whitehall sources argue that Mr Cameron has already secured a written vow by the 27 leaders that euro-zone deals may not undermine an achievement dear to Tory hearts the EU's internal market, with its free movement for capital, goods, people and services (at least in theory).
In theory, privatisation should bring the banks much-needed capital and expertise.
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Theory is that in an entirely closed economy it will be capital, the shareholders, that pay all of it.
In theory, an efficient tax system would tax both income and capital gains at the same rate and allow people to make their decisions on merit alone.
In theory, such specialisation should increase the efficiency of the venture-capital process, as it does in other industries.
And the regulators invented the Basel system of risk-weighted capital ratios, which stipulates different leverage ratios for different categories of loan, in theory to take account of the riskiness of those loans.
According to the Bank of England's analysis, if every single one of those countries went bust and wrote off 50% of their sovereign debt, banking debt and non-bank private-sector debt, that would wipe out around half the capital in the UK banking system - which is another way of saying that, in theory, the majority of our banks would limp on.
Meanwhile, Austrian theory focuses on the way changes of interest rates change the pattern of investment in capital goods.
But capital is expensive for banks to raise - because it is the money that is (in theory) most in danger of being lost when times are hard.
In theory, that will force investors into riskier assets like equities if they are looking for capital appreciation.
According to economic theory, this should reduce the relative price of labour and raise the global return to capital which is exactly what has happened.
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