ARE these the dog days of summer, or the start of something much worse? The stock markets have swung wildly in the past week, as the Unit Trust of India (UTI) tried to prop up share prices in the face of a selling onslaught by foreign institutional investors (FIIs). The UTI also had to tackle widespread selling in the market following rumours (despite denials by BSE president J.C. Parekh) that a group of brokers close to Harshad Mehta were facing default.