The U.K. PPI Input is a key economic indicator that reflects the average change over time in the selling prices received by domestic producers for their output. A lower than expected PPI Input suggests reduced inflationary pressures, which could lead to a less favorable economic outlook for the U.K. This, in turn, may negatively impact the performance of the iShares MSCI United Kingdom ETF (EWU), as it is directly tied to the performance of the U.K. market.