The graph shows the average salaries for senior high school principals from 1996 through 2008. 
Find the slope of the line segment connecting the points for the years 1998 and 2002.
Definitions:
Civilian Goods
Products and services intended for use by the general public rather than for military purposes.
Real Cost
The total cost of producing a good or service, including the opportunity cost of alternative uses of resources and inputs.
Wartime Shortages
Periods during war when there is a lack of availability of essential goods and resources due to increased demand and disrupted supply chains.
Opportunity Cost
The benefit missed out on when choosing one alternative over another, emphasizing the impact of choice on resource allocation.
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