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What market news to watch on Tuesday: The German ZEW, UK public sector net borrowing, BHP Billiton and Persimmon

21 August 2017: The German ZEW for August is due out at 10am, and the expectation is that it will fall to 17.1 from 17.5. Elsewhere, Persimmon is expected to surpass forecasts on both revenue and profits at its first half results.

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