(c) The social system under which men live together, make use of wealth and of their own services, and exchange economic goods.

(d) The people, considered with reference to their number, race, intelligence, education, and moral, political, and economic capacity.

The particular economic problems which are presented to each generation of our people are the resultant of all these factors taken together. A change in any one of them alters to some extent the nature of the problem. The problems change, for example, (a) with the discovery or the exhaustion (or the increase or decrease) of any kind of basic material resources; (b) with the multiplication or the improvement of tools and machinery or the invention of better industrial equipment; (c) with changes in the ideals, education, and capacities of any portion of the people whether or not due to changes in the race composition of the population; (d) with the increase or decrease of the total number of people, and the consequent shift in the relation of population to resources. Many examples of such changes may be found in American history, and some knowledge of them is necessary for an appreciation of the genesis and true relation of our present-day problems.

§ 4. #Attempts to summarize the nation's wealth.# If we seek to compare the material resources of the nation at one period in our history with those at another period, we find that it is impossible to find a single satisfactory expression for them. Let us examine the figures for the (so-called) "wealth of the people of the United States",[1] as it has been calculated by the census officials.

Average
total per capita
Population. "wealth." wealth.

1850 23,200,000 $7,136,000,000[a] $308 1860 31,400,000 16,160,000,000[a] 514 1870 38,600,000 24,055,000,000

[Footnote a: Taxable only; all other figures include exempt.]

[Footnote b: Estimated on a gold basis.]

A detailed comparison of the classes of concrete things making up the totals is possible only in the last three sets of figures (1900 to 1912), and they are here given (omitting 000,000).

1900. 1904. 1912. 1. Real property (excepting some items below) 52,538 62,331 110,700 2. Irrigation enterprises [a] [a] 360 3. Agricultural equipment (livestock, tools, etc.) 3,822 4,919 7,706 4. Manufacturing equipment 2,541 3,298 6,069 5. Transportation agencies 11,249 14,434 22,360 6. Telegraph and telephones 612 813 1,304 7. Waterworks (privately owned) 263 275 290 8. Electric lighting plants 403 563 2,099 9. Products (still in trade) 8,294 10,212 21,577 10. Direct goods in use[c] 6,880 8,250 12,758 11. Gold and silver 1,677 1,999 2,617