In the context of demand-pull inflation, the following options can be considered short-run effects:
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A rise in real output - In the short run, increased demand can lead to higher production levels, resulting in an increase in real output.
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A rise in the price level - Demand-pull inflation specifically indicates that an increase in overall demand leads to higher prices, thus resulting in a rise in the price level.
The other options (an unaffected real output and an unaffected price level) are not typical short-run effects of demand-pull inflation, as demand-pull inflation generally causes both an increase in real output and an increase in the price level.