Friday’s £6.4 billion banking rout demonstrated how a pre-existing condition—the government’s £40 billion deficit—is making the market dangerously susceptible to shocks. The proposal of a new bank tax might have been a minor tremor in normal times, but in the current fiscal environment, it was amplified into a major earthquake.
The IPPR’s suggestion of a windfall tax on banks was the initial shock. However, its power was magnified tenfold by the knowledge that the government is desperate for cash. This context makes any and every revenue-raising idea seem plausible, turning academic proposals into credible threats.
This amplification effect explains the scale and speed of the sell-off. Investors in NatWest and Lloyds didn’t react to a thinktank paper; they reacted to what that paper might mean in the hands of a chancellor with a £40 billion problem to solve.
The lesson for the government is that its own precarious financial position has become a major source of market instability. Until the underlying deficit is addressed, the market will continue to overreact to policy suggestions, and the risk of small shocks escalating into major crises will remain dangerously high.