Table A9

Most frequent Keywords Plus in LE globally and by period (1995–2024), and the evolution of core concepts and emerging topics.

	Global		2015–2024		2005–2014		1995–2004
R	Keyword	Occ	Keyword	Occ	Keyword	Occ	Keyword	Occ
1	Model	166	Impact	73	Model	62	Model	45
2	Impact	124	Model	44	Impact	31	Choice	24
3	Values	85	Values	32	Price	28	Values	24
4	Price	84	Willingness-to-Pay	30	Management	25	Contingent Valuation	20
5	Contingent Valuation	75	Price	29	Choice	24	Impact	20
6	Economics	74	Conservation	28	Values	23	Price	20
7	Policy	74	Economics	27	Contingent Valuation	22	Economics	19
8	Management	68	Demand	26	Policy	22	Policy	19
9	Choice	64	Management	26	Economics	21	Cost	17
10	Market	63	Contingent Valuation	24	Market	20	Demand	16
11	Demand	62	Policy	24	Willingness-to-Pay	19	Market	16
12	Cost	59	Preferences	24	Conservation	18	Public Goods	11
13	Willingness-to-Pay	59	Risk	22	Cost	17	United States	11
14	Conservation	55	Information	21	Risk	15	Benefits	10
15	Preferences	47	Market	20	Deforestation	14	Growth	10
16	Risk	46	Cost	19	Determinants	14	Management	10
17	Benefits	45	Benefits	18	Growth	14	Preferences	10
18	Impacts	43	Climate Change	18	Land	14	Quality	10
19	Valuation	43	Valuation	18	United States	14	Valuation	10
20	Information	42	Adoption	15	Benefits	13	Willingness-to-Pay	10
21	Growth	41	Determinants	15	Demand	13	Bias	9
22	Quality	38	Ecosystem Services	15	Incentives	13	Conservation	9
23	Efficiency	36	Growth	15	Preferences	13	Deforestation	9
24	Land	36	Choice	14	Efficiency	12	Efficiency	9
25	United States	36	Efficiency	14	Property Rights	12	Information	9
26	Determinants	33	Quality	14	Information	11	Property Rights	9
27	Property Rights	32	Behavior	13	Valuation	11	Uncertainty	9
28	Incentives	31	Choice Experiments	13	Behavior	10	Dichotomous Choice	8
29	Deforestation	30	Incentives	13	Quality	10	Land	8
30	Pollution	29	2 Keywords	13	2 Keywords	10	Referendum Data	8

Abbreviations: R = Rank; Occ = Occurrences. Note that currently, Keyword Plus is available in LE since 1991.