This paper is motivated by the observation that investment tends to accelerate when output is around trend. The model used to explain this observation is based on the capacity-constrained production setup in Hansen and Prescott [(2001) Manuscript], where capacity is constant over time, and on capital being owned by a fraction of the agents in the economy. When capacity is reached, the capital share increases because its component from capacity ownership becomes positive. The concentration of capital ownership leads then to an acceleration of investment-generated by the desire of capital owners to smooth consumption-as well as to a deceleration of total consumption. The results from the calibrated model contribute, although only partially, to the explanation of the observed behavior.