Investors in short-term bonds are least likely to be concerned with productivity risk. The reason for this is that productivity risk operates at business cycle frequencies and is therefore less relevant to investors with short investment horizons. In other words, the impact of productivity on the value of investments is more pronounced over longer periods. Therefore, for an investor in short-term bonds, changes in productivity are unlikely to have a significant impact on the value of their investment before it matures. This is why they are less concerned with productivity risk compared to other types of investors.

Choice A is incorrect. Pension funds are long-term investors who need to consider productivity risk as it can impact the returns on their investments over time. Changes in productivity can affect economic growth, inflation, and interest rates, all of which can have significant effects on the value of a pension fund's portfolio.

Choice B is incorrect. Sovereign wealth funds also need to consider productivity risk as they are typically invested in a wide range of asset classes across various countries. Changes in productivity can affect the relative attractiveness of different investments and thus influence the performance of a sovereign wealth fund's portfolio.

Choice D is incorrect. Family offices manage wealth for high-net-worth individuals or families and often have long-term investment horizons similar to pension funds and sovereign wealth funds. Therefore, they also need to consider productivity risk when making investment decisions.

Things to Remember

• Real Business Cycle (RBC) models are used in macroeconomics to explain the fluctuations in macroeconomic variables such as productivity, output, and employment over the business cycle.
• Productivity risk refers to the uncertainty or variability in the level of productivity in an economy, which can impact economic growth, asset prices, and investment returns.
• Investors with longer investment horizons, such as pension funds and sovereign wealth funds, are more likely to be concerned with productivity risk as it can affect the value of their portfolios over time.
• Short-term bond investors typically have shorter investment horizons and may be less concerned with productivity risk compared to long-term investors.