The Institute for Supply Management’s non-manufacturing business activity composite index slowed more than expected in June, as it fell to a four-month-low of 53.8, from a seasonally adjusted 55.4 in May, the group said Tuesday.

Economists polled by Thomson Reuters had expected a reading of 55.0 for the ISM services sector gauge. Readings below 50 signal a slowing economy, while levels above 50 suggest expansion.

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