New Delhi, Sept. 4 -- Close on the heels of Indian manufacturing showing robust growth on a widely tracked index, there's more cause for cheer; the services sector is doing just as well. The HSBC India Services Purchasing Managers' Index (PMI), compiled by S&P Global, climbed to 62.9 in August-the highest in 15 years-from 60.5 in July.

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Readings above 50 indicate an expansion in activity, while those below point to a contraction. That it rose further above the 60 mark suggests strong activity in the sector that accounts for the bulk of India's economy.

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Last month's spurt...