Consider the diagram below, which illustrates the transportation market of the United States with two different technologies, water transport (w) and railroad transport (rr).The marginal costs of each are depicted.The demand curves for transportation services in 1820 and 1890 are both depicted.

P. MC $10 + $9 $8 $7 MCw $6 $5 $4 $3 L $2 M $1 D1820 D1890 $0 0 200 600 700 500 400 800 300 900 1,000 1, 100 I else equal, find the social savings to the American economy in 1890 from ilroads