The composite is expected at 52.8 in the December flash versus 52.8 in November final. Manufacturing seen at 49.8 versus 49.6 in November. Services expected at 53.2 versus 53.6 in November.

The flash Composite Purchasing Managers' Index (PMI) provides an early estimate of current private sector business activity by combining information obtained from surveys of the manufacturing and service sectors of the economy. The flash data are released around ten days ahead of the final report and are typically based upon around 75-85 percent of the full survey sample. Results covering a range of variables including manufacturing output, employment, new orders, backlogs and prices are synthesised into a single index which can range between zero and 100. A reading above (below) 50 signals rising (falling) activity versus the previous month and the closer to 100 (zero) the faster is activity growing (contracting). The report also contains flash estimates of the manufacturing and services PMIs. The survey, produced by S&P Global uses a representative sample of around 5,000 manufacturing and services companies, the former including Germany, France, Italy, Spain, the Netherlands, Austria, the Republic of Ireland and Greece and the latter Germany, France, Italy, Spain and the Republic of Ireland.

Investors need to keep their fingers on the pulse of the economy because it dictates how various types of investments will perform. By tracking economic data such as the purchasing managers' manufacturing indexes, investors will know what the economic backdrop is for the various markets. The stock market likes to see healthy economic growth because that translates to higher corporate profits. The bond market prefers less rapid growth and is extremely sensitive to whether the economy is growing too quickly and causing potential inflationary pressures.