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We show that if Γ is a finitely presented metabelian group, then the “untwisted” fibre product or pull-back P associated to any short exact sequence 1→N→Γ→Q→1 is again finitely presented. In contrast, if N and Q are abelian, then the analogous “twisted” fibre-product is not finitely presented unless Γ is polycyclic. Also a number of examples are constructed, including a non-finitely presented metabelian group P with <img height="17" border="0" style="vertical-align:bottom" width="63" Ray Ban Canada Outlet alt="" title="" src="http://origin-ars.els-cdn.com/content/image/1-s2.0-S0022404902003079-si1.gif"> finitely generated. In this paper we show that if markets are incomplete and there are nominal assets, whose payoff is denominated in money, monetary policy will be in general non-neutral. The mechanism through which monetary policy operates is a change in Ray Ban Aviators Sale the structure of the rates of return: by changing the level of money prices monetary policy affects the payoffs of nominal assets. This differs from previous arguments for non-neutrality. We also show that a consideration of this effect of monetary policy may allow us to claim the superiority, from a welfare point of view, of a random money growth rate over a deterministic one. Journal of Economic Literature Classification Numbers: D52, E50, G10.