A decrease in onion supply coupled with increasing demand has led to a significant rise in the onion prices over the past fortnight. The farmers are holding back their onion stocks, hoping for an increase in prices in the market after the rabi crop of 2023-24 declined. The intense heat and sporadic, unseasonal rain showers have impacted the supply of tomato, potato and garlic as well, thereby causing a surge in the prices of these commodities.