How does slow price adjustment, as assumed in Keynesian models, result in real economic variables being affected by nominal variables?

What will be an ideal response?

If an increase in the money supply enables consumers and businesses to spend more, producers will respond by raising output. To do so, they will increase their purchases of labor and other inputs, and increase investment. Prices and wages will rise, but not so much or so quickly as to prevent the increase in real output and investment. The real interest rate may change, or not, depending on the changes in saving, investment, and expected inflation. But, the quantity of saving and investment will increase.