Plato saw that it might add a time and place value (p. 41, and notes). Footnote 240: Cf. above, p. 42, n. 7; also _Fors Clav._, Letters 45, 82; _Crown of Wild Olive_, II, 75 f. (Vol. XVIII, 450 f.). He argues that there should be no profit in exchange, beyond merely the payment for the labor involved in it. He insists that “for every plus in exchange there is a precisely equal minus.” Cf. _infra_ on Aristotle for a similar idea, pp. 107 ff. Footnote 241: _Op. cit._, p. 278, n. 2; cf. above, pp. 42 f. Footnote 242: Cf. p. 43. Footnote 243: _Ibid._ Footnote 244: _Ibid._ Cf. Ruskin’s more socialistic idea that all retailers be made salaried officers (_Time and Tide_, XXI, 134 [Vol. XVII, 427]). Footnote 245: Cf. e.g., Dem. _De corona_ 87; _Cont. Lept._ xx. 31; _Cont. Andr._ xxii. 15; _Cont. Lacrit._ xxxv. 50; Lysias xxii; Hdt. vii. 102; Thuc. iii. 86, and many other passages. For modern discussions, cf. Droysen, _Athen und der Westen_ (1882), pp. 41 ff.; Grundy, _Thucydides and the History of His Age_ (1911), pp. 58-95; Zimmern, _op. cit._, 1st ed., pp. 349 ff.; Gernet, “L’Approvisionment d’Athènes en blé,” _Mélanges d’histoire, ancienne_, 1909; Beloch, _G. G._, I, 406 f.; _Bevölkerung im Alterthum_ (1898), p. 30, etc. Footnote 246: _Rep._ 372C: οὐχ ὑπὲρ τὴν οὐσίαν ποιούμενοι τοὺς παῖδας. Footnote 247: _Laws_ 740D; but his specific methods for carrying out his difficult suggestion, if he had any to offer, were probably impracticable, judging by his discussion of women and children in the _Republic_. Ruskin’s suggestions for meeting the problem are colonization, reclamation of waste lands, and discouragement of marriage (_Unto This Last_, IV, 80 [Vol. XVII, 108]). Footnote 248: _Laws_ 740E; Ar. (_Pol._ 1265_b_6-12) unfairly criticizes him for limiting the amount of property, and making it indivisible, while failing to provide against a too high birth-rate. Footnote 249: 741A. Footnote 250: Cf. Ruskin, cited above, p. 27. Footnote 251: For the Greek term, cf. _infra_ on Aristotle. Footnote 252: Cf., however, Xen. _Mem._ ii. 7. 12-14, discussed _infra_, which may be a suggestion of a theory of profits. Footnote 253: _Laws_ 921A-D, discussed on p. 39, n. 8; cf. also 847B. Footnote 254: