Lakatos' MSRP is utilized to provide a response to Koertge's claim (in her ‘Does Social Science Really Need Metaphysics?’) that the heuristic significance of metaphysics has been vastly overrated. By outlining the hard cores and positive heuristics of the two major research programmes in economics (namely, the ‘orthodox’ and ‘Marxist’ research programmes), the paper demonstrates (in opposition to Koertge's claim) not only that the metaphysical statements in the respective hard cores are far from vague but also how these exert an (...) important regulative influence both on the theories and economic policy recommendations generated within the respective programmes. It also indicates how the adoption of the MSRP method of appraisal in economics would help to protect against the danger of entrenched metaphysical dogmatism with its implications not only for economic policy recommendations but also for moral and political recommendations. * We appreciate the assistance given by Professor N. Koertge, who provided us with translations of her articles, and the helpful comments of an anonymous referee. (shrink)