The players
Buyers – those with ready cash looking for investment opportunities. More commonly known as investors.
They can come in all manner and form – everything from the giant life assurance companies that invest our savings for retirement, right down to the individual stock market prospectors.
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Sellers – they are the people who need or want cash. When I say people, it's doubtful that one individual will come to the market and borrow funds.
It is much more likely to be a huge multi-national company, or a government.