The Chicago Purchasing Managers' Index (PMI) is a diffusion index incorporating survey results provided by manufacturing firms around the Chicago area. A reading above fifty suggests the manufacturing sector is expanding, while a reading below fifty suggests the manufacturing sector is in contraction. The Chicago PMI can be of some assistance in forecasting the ISM manufacturing PMI.
A reading that is stronger than forecast is generally supportive (bullish) for the USD, while a weaker than forecast reading is generally negative (bearish) for the USD.