New Delhi, Feb. 12 -- Policymakers have given consumption a push. Income taxpayers in India will be left with more money, while loans taken to buy stuff will burden consumers less. The cheer yielded by this policy stimulus, however, should be viewed in the context of the 'wealth effect'.

When asset values rise, investors at large feel richer and spend more freely. And when they drop, not only do they feel financially deflated, 'loss aversion' could leave them feeling worse than a rational lens would justify, making them extra cautious about spending.

Sadly, India's stock market has been on a long slide that doesn't seem to end. Including Tuesday's fall, investors have jointly lost Rs.18 trillion in five days. The impact of asset deflati...