Marx noted, in Capital III, Chapter 23,
“It would be still more absurd to presume that capital would yield interest on the basis of capitalist production without performing any productive function, i.e., without creating surplus-value, of which interest is just a part; that the capitalist mode of production would run its course without capitalist production. If an untowardly large section of capitalists were to convert their capital into money-capital, the result would be a frightful depreciation of money-capital and a frightful fall in the rate of interest; many would at once face the impossibility of living on their interest, and would hence be compelled to reconvert into industrial capitalists.” (p 378)
It is precisely that problem that the ruling-class of rentiers has faced. On the one hand, the microchip revolution of the 1980's, brought a huge rise in productivity, and the rate of profit. It brought a huge moral depreciation of the fixed capital stock, and with it a huge, global release of capital. All of these realised money profits fed into money markets, causing global interest rates to enter a secular decline from 1982 onwards, and a consequent rise in global asset prices.
In the US, stock markets rose by around 1300% between 1980 and 2000, more than 4 times the rise in GDP. Stock and property markets across the globe followed suit.
In Britain, house prices quadrupled in the 1980's. No wonder, in this “loadsamoney” culture, this inflation of asset prices, seemed to amount to the creation of wealth out of thin air.
Of course, ownership of speculative assets is neither the same as ownership of productive-capital, nor the same as ownership of a durable commodity. If you own bonds or shares, for example, if the market price of those assets rise sharply, you can sell them, and simply pocket the capital gain. You don't have to buy other bonds or shares to replace them. If you own property as a speculative asset, or as a landlord, you can similarly, sell those properties, if property prices rise sharply, without needing to replace them. In both cases, you can simply bank the realised capital gains, and wait until asset prices fall again. But, that is not the case if you own a property as a durable commodity/fixed capital.
If house prices rise, as a homeowner, that is of little benefit to you, for the simple reason that if you come to sell your home, you still need somewhere to live, and so must replace it with an equally more expensive house. If you are a commercial business that owns the commercial property in which you operate, the same applies, the building constitutes a piece of fixed capital. In fact, a rise in property prices, generally operates to your disadvantage, rather than advantage. If house prices across the board double, but wages remain the same, then, the house you paid £50,000 for, when you sell it for £100,000, appears to have provided you with £50,000 for free. But, to move to a better house, means that, this better house, which previously cost £75,000, will now cost you £150,000. In reality, you will have lost £25,000, compared to had house prices not risen.
Of course, had you not been a homeowner to start with, you would have lost out even more, which is why so many people, now, cannot afford to buy a home. Yet, the bourgeois media portray any fall in asset prices as being catastrophic, despite the fact that, for the great mass of society, they would be hugely beneficial. Indeed, for industrial capital, they would be hugely beneficial too, as I have set out, elsewhere. Its not just those who cannot afford to buy a home that are adversely affected by high house prices. One solution to the inability to pay the high prices, would be, for example, for wages to rise. But, a rise in wages, means a fall in industrial profits. Many unable to buy, are led to rent, but, that leads to higher rents, which again, means either higher wages, or else higher levels of housing benefits. Those higher benefits require higher taxes, which again, reduces industrial profits.
As I've set out, elsewhere, the same is true with inflated bond and share prices, which form the basis of workers' pension funds. The delusion referred to earlier, in which money-capital is seen as the only real capital, and the interest on which is seen, not as a deduction from industrial profit, but as some kind of natural fruit of that capital, leads to the assumption that if asset prices rise, the fruit of those assets increases along with it, like a bigger plum tree, producing more plums. But, as Marx set out, interest/dividends are simply a deduction from profit, and if the mass of profit does not rise, there is no sustainable basis for interest/dividends to rise. If interest/dividends do rise, without the mass of profit rising, then, rent, tax or profit of enterprise must fall, as Marx set out in Capital III, Chapter 15.
But, unless capital is accumulated – more labour employed – the only way to increase the mass of surplus-value/industrial profit, is to raise the rate of surplus-value. In the conditions of the 1980's, and 90's, as the huge rise in productivity created large relative surplus populations, which pushed down relative wages, and also reduced the value of labour-power, and so raised the rate of surplus value that was possible. Indeed, by raising the rate of turnover of capital, it also raised the annual rate of surplus-value, and average annual rate of profit. It, also, as set out earlier, created a release of capital that appeared as a mass of realised money profit. But, that was then, and this is now. Those conditions began to change when the new long wave upswing began in 1999, just as they have done in previous long wave cycles.

