The Securities and Exchange Board of India’s (Sebi's) proposal to restrict retail investors from taking large exposures in the stock market by setting trading limits based on income, or net worth, is ill-conceived. According to the proposal, which came from the Committee on Fair Market Conduct headed by T K Vishwanathan, Sebi should limit the trading activity of retail participants based on their net worth. The market regulator is now said to be asking brokers to set up systems where clients will submit a net worth certificate to the broker. Trading limits will be set accordingly. This is conceived as a risk-mitigation measure to prevent small investors from losing large sums. But there are several reasons why this proposal should be turned down. It is the market regulator's job to ensure that trading is conducted in a free, fair and transparent manner without manipulation. This includes overseeing brokers and ensuring that exchanges set and collect appropriate margins to guard against defaults. But it is outside the regulator's brief to attempt to limit the losses of any given participant in a transaction, so long as that investor has submitted the required margins to settle a trade.
Moreover, net worth is hardly a reliable indicator of the capacity to invest, or to understand the risks inherent in a financial investment. A young professional may have extremely low, or even negative net worth, if she is paying off education loans. But such a person could be investment-savvy as well as cash-rich in the sense that she has a high savings rate. Any net worth based restriction would punish such an individual by excluding her from investing. Conversely, an elderly landowner could have high net worth, while being ignorant of the dynamics of financial markets. Such a person would be fleeced while still meeting the valuation criteria.