Billionaires have been trading multimillion-dollar real estate with tremendous zeal in recent years, slapping down record sums for trophy homes while quietly floating other properties in their portfolios through brokers in unofficial, off-market offerings.

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The rupee plummeted 16% to 63 to the dollar in the unofficial but government-sanctioned curb market on the same day.

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It is one of several unofficial proposals to liberalise the labour market and increase government revenue, contained in a paper seen by the BBC.

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In the absence of any official estimate of the size of the stimulus, market-watchers looked for an unofficial figure to fill the gap.

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The outdoor space is also an unofficial graffiti exhibition with two works by British street artist Banksy and local artists working on walls around the market.

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