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Table 13.1--Subregional Timber Supply Model (SRTS) assumptions

Variable	Scenariosa	Species	Ownership	Value	Source of the Assumption
Assumed annual outward shift (increase) in timber demand	All	All	All	1.6%/yr	1993 RPA
Southern pine plantation area elasticity with respect to timber price	All	All	Industry	0.60	Murray and Lee (1990)
	All	All	NIPF	1.8	Murray and Lee (1990)
Timberland area elasticity with respect to timber price	All	All	All	~0.3	Hardie and others (2000)
Rural area elasticity with respect to Population, Income, and Agricultural Rents	All	All	All	Imbedded	Hardie and others (2000)
Supply price elasticity	All	Hardwood	All	0.45	Adams and Haynes (1996)
	All	Softwood	All	0.29	Adams and Haynes (1996)
Demand price elasticity	IH	All	All	-0.50	Abt and others (2000)
	IL	All	All	-0.50	Abt and others (2000)
	EH	All	All	-5.00	This Assessment
	EL	All	All	-5.00	This Assessment
Southern pine plantation growth rates	IH	All	Industry	75% by 2040	This Assessment
	IH	All	NIPF	37.5% by 2040	This Assessment
	IL	All	Industry	50% by 2040	This Assessment
	IL	All	NIPF	25% by 2040	This Assessment
	EH	All	Industry	75% by 2040	This Assessment
	EH	All	NIPF	37.5% by 2040	This Assessment
	EL	All	Industry	50% by 2040	This Assessment
	EL	All	NIPF	25% by 2040	This Assessment

^a NIPF = nonindustrial private forest; IH = (base case) inelastic timber demand and high plantation volume growth rates; IL = inelastic timber demand and low plantation volume growth rates; EH = elastic timber demand and high plantation volume growth rates; EL = elastic timber demand and low plantation volume growth rates.

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