To most of us who are not economists or in government, it is regarded as common sense that we need manufacturing and other producing businesses to pay for public services.
The financial sector, which includes insurance, pensions, accountancy and retail banking is a valuable part of the UK economy.
However, there are serious concerns that the casino banking sector is extracting rather than producing wealth, and that it is harming rather than benefiting the economy.
One of the concerns relates to the huge level of merger and acquisition (M&A) activity, which means that UK companies can easily be taken over by foreign companies. There is a theory that it does not matter who owns UK companies, only how they are run. This is wrong. Inevitably, and this may take decades, manufacturing is moved abroad.
The other, just as serious, the problem with the open market in UK companies is that the continual threat of hostile takeovers deters long-term investment.