My monetary policy models indicate the MPC should have cut rates yesterday while the ECB should have signalled an easing bias. The intransigence of the two central banks despite mounting economic risks from credit market deterioration and a sinking dollar threatens to push markets to a “riot point”.

As others have noted, there are similarities with events preceding the October 1987 stock market crash, when the Bundesbank defied an international effort to support the dollar by raising interest rates in response to an oil-induced rise in inflation. While the ECB and MPC were on hold yesterday, interbank rates have been climbing.

Stock markets have been sliding rather than plunging but credit markets have already crashed. On one measure of the yield spread of sterling corporate bonds over gilts, the rise over the last six weeks represents a four-standard-deviation event.

I still think a hard economic landing is avoidable and plentiful liquidity will limit stock market damage but central banks are increasing the risks. The Fed is as much to blame, with its panic cuts serving mainly to undermine the dollar and inflate a commodity bubble. There is a strong case for coordinated policy action, with the Fed holding US rates at current levels and the ECB and other major central banks easing. Markets may force such action if it does not occur voluntarily.

A rate cut was needed to offset the negative economic impact of the significant deterioration in credit markets over the last month. Rising inflation reflects surging commodity prices, over which the MPC has no influence. Wage settlements remain stable and are unlikely to pick up against the backdrop of a cooling labour market. The MPC’s failure to act today increases the risk of serious economic weakness and an eventual inflation undershoot.

The MPC-ometer was wrong this month. The last miss was in June last year, when a quarter-point rise was predicted. Subsequent minutes revealed a 5-4 split and rates moved as forecast a month later.

My suggestion of a surprise rate cut tomorrow looks less likely following today’s strong services purchasing managers’ survey for February. The business activity index rebounded to a five-month high, while prices charged surged to a new record.

The case for a reduction rests on credit market deterioration since the last MPC meeting. Three-month LIBOR has risen from 5.58% before the February rate cut to 5.77% currently, while the yield spread of A-rated sterling bonds over gilts has climbed 48 bp, reaching its highest level since before the early 1990s recession. These changes imply the economy faces increasing financial headwinds despite last month’s policy move.

Incorporating the services PMI results, the MPC-ometer rates the chances of a cut tomorrow at exactly 50%. It continues to suggest a high probability of a reduction by April.

The purchasing managers’ survey is strangely at odds with the CBI / Grant Thornton survey of consumer and business services, also published today. The CBI survey reported a sharp drop in expected business volumes and a reduction in price expectations. As the charts below show, the two surveys normally correlate closely, raising the possibility that this month's PMI improvement will prove a blip.

My MPC-ometer model is forecasting an "average interest rate recommendation" of -13 bp at this week’s MPC meeting – just beyond the 12.5 bp threshold, suggesting a 5-4 vote for a 25 bp cut.

A week ago, the model was pointing to a 6-3 majority for unchanged rates. The swing factors over the last couple of days have been weak February consumer confidence results and a further deterioration in credit markets.

One missing input is the purchasing managers’ services survey, released on Wednesday. Any weakness relative to last month’s results would obviously boost the chances of a cut.

This could be one of those occasions (such as June last year) when the model is a month early. Its historical performance in backtests is 90%; of the 10% of misses, half have been due to the model predicting a change one month in advance.

Another cut this month would sit uneasily with MPC communications indicating concern that the coming rise in inflation will further destabilise expectations. However, MPC members have also stressed the risks posed by tighter credit conditions. Credit spreads have widened significantly further since their last meeting, in some cases reaching the highest level since before the early 1990s recession. Three-month LIBOR has also been firming – it was set at 5.74% on Friday, far above Bank rate of 5.25%.

For comparison, the Sunday Times Shadow MPC voted 7-2 to leave rates unchanged this month.