On Monday morning, you’ve got to face the CFO and defend your budget. It would sure help if you could argue that past IT expenditures have increased the productivity of your company before you explain why your budget should go up this year. n Well-prepared is well-armed, so here CIO presents two sides of the heated productivity debate. You can quote Edward Yardeni, chief investment strategist at Deutsche Banc Alex.Brown, to prove that investing in IT does enhance the productivity of your workers and will continue to do so. And you’ll be prepared for those pesty counterarguments by reading the perspective of Robert J. Gordon, the Stanley G. Harris professor in social sciences at Northwestern University in Evanston, Ill.