TABLE 13. PRODUCTIVITY ASSUMPTIONS

			Low	Median	High
This study*

	Developed	-.5	1.7	4.0
	Developing	-1.0	2.9	5.5

Nordhaus and Yohe**	.7	1.5	2.5

*See Appendix A for a description of the full distribution.

**Average rate over 75 years; actual rates are assumed to decline over time.