Rent-Seeking in Noxious Weed Regulations: Evidence from US States



Table 2. Estimates of Cross-State Weed Regulatory Congruence, 1997

Slope Coefficients a

Sign of
Dissimilarity

List 1
NWS

List 2
NWS Prohibited

List 3
NWS Restricted

List 4

NW

I1. Average Temperature

Negative

4.9813

84.4727**

-21.3807**

6.1407

.

(3.2738)

.

(4.4132)

.

(3.4548)

.

(7.1744)

Positive

-97.3581**

-42.5648**

-79.4742**

-44.4595**

(4.7132)

(7.0742)

(5.0572)

(9.1408)

I2. Average Precipitation

Negative

10 5249**

7 3781**

5 1682**

13 8153**

.

(0.6986)

.

(0.8859)

.

(0.7147)

.

(1.3309)

Positive

-22.7889**

-19.4822**

-32.4031**

6.8839

(1.9501)

(2.7352)

(2.1169)

(3.9889)

I3. Variance of Temperature

Negative

0 0018

-0 0054

0 0074

-2 6872**

.

(0.0037)

.

(0.0038)

.

(0.0040)

.

(0.5272)

Positive

-6.9931**

-4.6264*

-6.1663**

-11.0265**

(1.5677)

(2.2303)

(1.6542)

(2.6504)

I4. Variance of Precipitation

Negative

0 0001*

-0 0000

0 0001**

-0 0250*

.

(0.0000)

.

(0.0000)

.

(0.0000)

.

(0.0114)

Positive

-6.64113**

-16.6602**

-5.91907**

-8.7547**

(1.51491)

(2.17302)

(1.59267)

(2.89615)

I5. Land Share Index

Negative

0.0377

0.0294

0.0122

0.0368

(0.0245)

(0.0358)

(0.0229)

(0.0189)

Positive

-0.0057

0.0581

-0.0163

-0.0665*

(0.0293)

(0.0430)

(0.0274)

(0.0334)

I6. Water Share Index

Negative

0 2186

0 3907*

0 1230

0 3155

.

(0.1413)

.

(0.1844)

.

(0.1629)

.

(0.4434)

Positive

-0.2210

-0.6354**

-0.1177

-0.3793

(0.1140)

(0.1531)

(0.1319)

(0.3691)

I7. Soil Share Index

Negative

0 0203

-0 2286

0 1888

-0 7390

.

(0.1952)

.

(0.2656)

.

(0.2135)

.

(0.4173)

Positive

-0.0570

0.4465

-0.3991*

0.1713

(0.1679)

(0.2289)

(0.1816)

(0.3871)

A1. Field Crop Land Share

Negative

3 8381**

7 9762**

4 8898**

2 9998

.

(1.4170)

.

(1.9874)

.

(1.4321)

.

(1.9787)

Positive

-13.3076**

1.0805

-15.4310**

-18.7375**

(2.6138)

(3.7531)

(2.8232)

(4.3266)

A2. Irrigated Land Share

Negative

0 0151

-0 0455**

0 0631**

0 0287

.

(0.0122)

.

(0.0176)

.

(0.0131)

.

(0.0183)

Positive

-6.8743**

-3.6522

-3.6564*

-5.2978*

(1.4686)

(2.0594)

(1.5625)

(2.5443)

ωc: Lobby of Consumer

Negative

0.0230

0.0107

0.3081**

-0.3546**

.

(0.0697)

.

(0.0913)

.

(0.0834)

.

(0.1143)

Positive

-5.6111**

-2.9029

-4.0133*

0.6874

(1.6113)

(2.2071)

(1.6983)

(2.7670)

ωs: Lobby of Seed Industry

Negative

-0.0387

0.0162

-0.0436

0.0465

.

(0.0259)

.

(0.0306)

.

(0.0294)

.

(0.0588)

Positive

-0.0484

2.1991

1.5123

-3.69253

(1.4357)

(2.0100)

(1.5100)

(2.4161)

ωm: Lobby of Commodity

Negative

0.0708

-0.1074

0.2051*

-0.5762**

Producer

(0.0764)

(0.0902)

(0.0828)

(0.1407)

Positive

0.3841

0.3476

-0.6256

1.9280*

(0.5914)

_________(0.7400)

_________(0.6747)

(0.9482)

** and * denote significance at the 1% and 5% level, respectively; number in parenthesis is standard error.

aI1 through I7 indicate ecological dissimilarity indexes, A1 and A2 are agronomic dissimilarity indexes, and ωk,
k=c,s,m, denote lobbying dissimilarity indexes.

28



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