A simple neo‐classical theory of the demand for capital goods service is presented to clarify the relationship between the marginal productivity of capital and Keynes′s concept of the marginal efficiency of capital. How the latter concept is related to con‐temporary understanding of the...

Abstract Recently, Ohta et al. [Quality and Reliability Engineering International 17: 439-446, 2001] have studied the economic design of CCC (Cumulative Count of Conforming)- r charts for high-yield processes assuming a fixed hazard rate. Generally, however, the hazard rate is varying over time....