In the third installment of the class series, we begin by elaborating the concepts of energy-flux density and potential relative population density through an examination of the 1960s Apollo program as a case study of a physical-economic science driver, followed by the closely related subject of a credit system as a uniquely human expression of consciously directed negentropy. Within this context, the implications of a future-oriented economic policy for our understanding of physical — as opposed to absolute — time is discussed.