Which of the following is a social force affecting property value?

Population densities are indeed a significant social force affecting property value. This is because population density can indicate the level of demand for housing in a particular area. Higher population densities often lead to increased demand for residential properties, which can drive up property values. When more people are living in a given area, it can result in a competitive market, leading to higher prices for homes and properties.

Additionally, areas with high population densities are typically associated with greater access to services, amenities, and jobs, all of which further enhance the attractiveness of the location and its property values. Urbanization trends show that areas with more people tend to have better infrastructure and more significant investment in community resources, which also boosts property demand and value.

While the other options relate to economic and financial aspects influencing property values, such as employment rates which affect purchasing power, interest rates that influence borrowing costs, and location which pertains more to geographic desirability, they do not capture the social dynamics involved in how populations influence property market trends as directly as population densities do.