The study explores how lumpy investments by businesses affect the economy during different phases of growth and recession. The researchers found that more firms tend to make big investments during economic expansions than during downturns, leading to a cyclical pattern in investment responsiveness to economic shocks. By aligning the model with real interest rate dynamics, the study shows that interest rates play a crucial role in shaping investment behavior at the macro level. This insight helps policymakers better understand how stimulus policies can influence business cycles.