Rebalancing an investment portfolio at specific periodic levels is more favourable than buying and holding because it offers a sustainable process that can approach the volatility and the upsides and downsides of the market unemotionally through a mathematical approach, according to Swarup Mohanty, CEO, Mirae Asset Investment Managers (India). Investors should review and rebalance their portfolios periodically, and rebalancing can help maintain the actual asset allocation closest to their risk profile, he said.