WeiGucrop.jpg– Wei Gu is a Reuters columnist. The opinions expressed are her own —

Just as Chinese stocks often rise without fundamental support, they are now tanking even though companies just had a better-than-expected earnings season.

Fears about a policy shift towards tighter liquidity are blamed for the 22 percent decline in the Shanghai market from its August peak. But those fears are largely overblown. Beijing might be talking about boosting domestic consumption, but structural reforms take time and there is little the authorities can do other than continuing to reinflate the economy in the short run.

There are encouraging signs that corporate profits — the fundamental basis for share prices — are on the turn.

Chinese companies’ earnings for the past quarter rose 36 percent compared with the previous three months, helped by strong results from banks and property firms. Companies also offered a more optimistic outlook, propelling a string of earnings upgrades.