Why is the electronics industry concentrated in Bengaluru, Hyderabad and Pune?

These cities have a large pool of trained engineers from their universities and technical institutes, established research and defence establishments, a pleasant climate and good air links, and government support through software technology parks. Once a cluster forms, further firms are drawn to the skills and the suppliers already there.

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Explanation

The industry is footloose, so it is not tied to raw material or to power.