This paper discusses the principles that justify activism of governmen
ts in the management of public debt. It starts from a review of the ec
onomics literature, which has produced especially in recent years, a n
umber-of important propositions on the desirability of government inte
rventionism, either for the purpose of filling information gaps or to
help solve dynamic inconsistency problems. It then considers a number
of practical arguments for government activism, stemming from the deve
lopment of capital markets, and the need to keep up with them. The pap
er argues that government activism in debt management is much less war
ranted than the current economic literature or market practices might
lead us to believe. The fundamental reason is that governments are not
a private actor in the market, and so their optimization problem is r
adically different from that of other market participants.