The OECD explains this upwards correction with tax cuts in the United States, amongst other things, which is expected to effect a growth of 2.9%. For Germany, the forecast is a gain of 2.4% instead of the previously announced 2.3%.
Next year, the growth in Germany is expected to amount to +2.2% instead of 1.9%. The OECD lists higher government expenditures by Germany's grand coalition as a reason for this adjustment.
