9392

• UCREFRP Catalog Number: 9392
• Author: Brookshire, D. S., M. McKee and S. Stewart.
• Title: A Four Corners Regional Focus on the Economic Impact of Critical Habitat Designation for the Razorback Sucker, Humpback Chub, Colorado Squawfish, and Bonytail.
• USFW Year: 1996.
• USFW - Doc Type: Albuquerque.
• Copyright Material: NO

Chapter 3 Methodology of the Analysis
A. Input-Output Modeling
To evaluate the impacts associated with actions taken on behalf of the endangered Colorado
River fishes in the Four Comers Region, a regional input-output (I-O) model was constructed for
the 10-county region. The modeling methodology was described in detail in the Colorado River
Fishes Report (see Brookshire et al., 1993) and the reader is referred there for further details. A
brief summary follows.
The I-O method is straight forward: all sectors of the economy are tied together by virtue of
economic relations called "linkages" and the production of a good or service can be described by
a "recipe" with the ingredients being the outputs of the other sectors of the economy as well as
the primary inputs such as labor, capital, and other raw resources. A simplified example is
provided in Figure 3-A-1.
3-A-1 Sim listed Numerical Ezam le of an I-O Model
Producing Purchasing Sectors Household Final Gross
Sectors 1 2 Consum tion Demand Ou ut

1
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Labor 300 500 50 150 1000
Value Added 350 800 600 400 2150
Total
Payments 1000 1900 1000 2150 6150
In Figure 3-A-1, there are two sectors (1 and 2) in the economy. The four shaded elements in the
upper left comer of the table represent the inter-industry flows (the linkages) between the
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