Analysts said data pointed to a shrinking economy which would hurt profits and further undermine share prices. The latest blow came from the Institute of Supply Management's non-manufacturing index. The index, which covers roughly 80% of the world's biggest economy, fell to 53.1 in July, from 57.2 in June, below economists' expectations. That indicates that the biggest slice of the economy is barely growing - and may start contracting as early as this month.