Table 3.

Own-price and cross-price elasticity values (proportion change in tokens produced / proportion change in price) for all subjects in price-change conditions in Phase 1: B (when food prices changed) and C (when water prices changed). Own-price and cross-price columns show elasticity values for combined (specific and generalized) tokens, whereas the other columns (Spec, Gen) show the same measure for each token type separately. See text for additional details.

Pigeon	Condition	Own price	Own-Spec	Own-Gen	Cross price	Cross-Spec	Cross-Gen
999	B: food	−1.07	−1.11	−1.07	+0.55	+0.09	+2.99
	C: water	−0.79	−0.95	−0.07	+0.33	+0.37	+0.33
723	B: food	−1.08	−1.10	−0.91	+0.94	+0.06	+137.30
	C: water	−0.98	−0.97	−1.11	−0.32	−0.35	−0.04
271	B: food	−1.10	0	−1.10	+0.77	0	+2.48
	C: water	−1.11	0	−1.11	+0.18	0	+0.18
113	B: food	−1.03	−1.05	−0.94	+1.75	−1.05	+1.92
	C: water	−0.94	0.14	−1.03	+0.39	+0.23	+0.55