Abstract
We analyse a different timing implementation of environmental regulation and compare the effects on the markets from a policy innovation perspective. The paper addresses the question: Should a regulator try to commit to a policy (ex-ante regulation) or rather adapt its policy to a firm’s decisions (ex-post)? The findings are of interest towards improving regulatory effectiveness and economics efficiencies, e.g. for the transatlantic regional relationship between EU and USA. Our findings highlight differences in policy timing between markets may be harmful. The transatlantic regulators should consider the timing of the policy innovation for the achievement of mutual benefits.
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Notes
A possible extension could be the case of the emission permits. For the case of environmental taxes see Innes and Bial (2002).
For examples of innovation policy instruments see Borras and Edquist (2013).
A similar approach is followed by Khan et al. (2014) under an informal analysis and for the case of the renewable energy in a monopoly market. In our case we focus on the case of the environmental anti-pollution technology and we analyse a formal model under monopoly and oligopoly markets.
The trade-off between the two (regulator’s) priorities is close to the reality and represents this case where one could be better off if someone else will be worst off. Furthermore we assume b ∈ (0, 1), thus there are not extreme priorities.
In our paper and contrary to Asproudis and Gil-Moltó (2015) we assume decreasing returns to scale. The “Quadratic cost functions reflect decreasing returns to scale or diseconomies of scale and are frequently met in applications, for instance in the modeling of renewable resources exploitation” Dubiel-Teleszynski (2011). Also the decreasing returns to scale could represent the “limited supply of industrial land and buildings” like in the case of Singapore’s manufacturing sector (Kee 2002).
Following Asproudis and Gil-Moltó (2015), the technological cost is not connected directly with the production level but with the anti-pollution technology. For example, this could be the case of the number of the filters in the smokestack or the number of catalysts in the cars (for similar cases see Keohane 2002,Chao and Wilson 1993,Srivastava et al. 2001).
All the steps of the two models and the analogous calculations are available to the reader and are included in the Appendix.
See the Appendix for the proof of Lemma 1.
See Appendix for the proof of Lemma 2.
We set \(\frac { \partial \bar {SW}_{1}}{ \partial b} = 0\) and we solve with respect to b, Then, the quadratic form will give two possible solutions. \(b_{1} = 1 -\frac {a e^{2}}{\sqrt {a e^{2} (8 (1 +c) e +a (2 + 4 c +e^{2}))}}\) and \(b_{2} = 1 +\frac {a e^{2}}{\sqrt {a e^{2} (8 (1 +c) e +a (2 + 4 c +e^{2}))}}\), the second solutions is rejected because b < 1.
\(\frac {\partial \bar {q}_{2}}{ \partial b} =\frac {4 a (b -1) b e^{2}}{(4 (b -1)^{2} (1 +c) +b^{2} e^{2})^{2}} <0\), where numerator < 0 and denominator > 0, ∀b < 1. Also, \(\frac { \partial \bar {k}_{2}}{ \partial b} =\frac { -4 a (b -1)^{2} (1 +c) e +a b^{2} e^{3}}{(4 (b -1)^{2} (1 +c) +b^{2} e^{2})^{2}}\) where denominator > 0 and numerator\( \lessgtr 0\), ∀b < 1.
There are two possible solutions; \(e_{1} = -\frac {2 (b -1) \sqrt {1 +c}}{b}\) accepted, \(e_{2} =\frac {2 (b -1) \sqrt {1 +c}}{b}\) rejected ∀e > 0.
In order to guarantee a real number for the ecvwe set − 1 + 2ci − 2cj(3 + 2cj) > 0 or \(c_{i} >\frac {1}{2} (1 + 6 c_{j} + 4 {c_{j}^{2}})\).
The Second Order Conditions (SOC) are satisfied \(\frac { \partial ^{2}{\Pi } }{ \partial q^{2}} = -2 (1 +c) <0\).
The SOC is \(\frac { \partial ^{2}S W^{ \ast }}{ \partial k^{2}} = 2 (b -1)\), which is negative since b < 1.
The SOC is negative so, it guaranties the optimum value of \(k_{2}^{ \ast }\).
The SOC is negative and equal to \(\frac { \partial ^{2}{\Pi }_{2}}{ \partial q^{2}} = -2 -2 c -\frac {b^{2} e^{2}}{2 (-1 +b)^{2}}\).
The Second Order Condition (SOC) is satisfied \(\frac { \partial ^{2}{\Pi }_{i}}{ \partial {q_{i}^{2}}} = -2 (1 +c_{i}) <0\).
The SOC is \(\frac { \partial ^{2}S W^{ \ast }}{ \partial k^{2}} = 2 (b -1) <0\), ∀b < 1.
The SOC is negative (2(b-1)) so, it guaranties the optimum value of k.
The SOC is \(\frac { \partial ^{2}{\Pi }_{i}}{ \partial {q_{i}^{2}}} = -2 -2 c_{i} <0\).
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We would like to thank the editor and the anonymous referee for the constructive com- ments for the improvement of this paper. Also, we would like to thank participants at the EAERE 2016 and ASSET 2014 for comments and suggestions on previous versions of the paper. The usual disclaimer applies.
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Appendix
Appendix
1.1 Ex-ante Scenario - Monopoly
1.1.1 Stage 2: Firm Decides on Output
We calculate the First Order Conditions (FOC)Footnote 16
and solving with respect to q the firm’s level of production and the analogous profits are
where the subscript 1 indicates the first scenario (ex-ante).
1.1.2 Stage 1: Regulator Decides for Technology
After the substitution of Eq. 6 into Eq. 1 we have
and from the FOC we obtainFootnote 17
yielding the optimum technology
where \(\frac { \partial \bar {k}_{1}}{ \partial b} <0\) thus, the technological choice is reducing in b or the higher the value of the parameter b the less polluting the technological choice k is. We substitute all the results to the initial equations and therefore we have the results for the ex-ante case. Particularly, the profits are given by
and the price of good in the market is
After substituting the technology to the Social Welfare (8) we obtain:
where A = (b − 1)(2a(2c(b − 1) + b − 2) + 8b(1 + c)e).
Also, the firm’s emissions are
where \(\frac { \partial \bar {y}_{1}}{ \partial b} <0\) thus, emissions’ level is decreasing in b. Finally, the damage to the environment is equal to \(\bar {DF}_{1} =e \bar {y}_{1}\).
1.2 Ex-post Scenario - Monopoly
1.2.1 Stage 2: Regulator Decides for Technology
The regulator decides on the technological level in order to maximize the social welfare. The FOC is equal to:Footnote 18
and solving with respect to k we have
where the subscript 2 indicated the ex-post case.
1.2.2 Stage 1: Firm Decides on Output
After the substitution of k∗ into the profit’s equation we have \({\Pi }_{2} =(a -q) q -c q^{2} -\frac {b^{2} e^{2} q^{2}}{(2 b -2)^{2}}\). As usual we calculate the FOC which isFootnote 19
and solving for q we calculate the optimum level of output
We substitute \(\bar {q}_{2}\) into \(k_{2}^{ \ast }\) and then we have the optimum technology for this model
Hence, the final results for the ex post model are; profits equals
and price of the good is
After the necessary substitutions and calculation we get the Social welfare
where X = − 8(b − 1)2b(1 + c) − 2b3e3 and Y = a(b − 1)(− 2(b − 1)(b − 2 + 2(b − 1)c) − 3b2e2).
The level of the emissions are given by
where L = 4(b − 1)2(1 + c) + b2e2. So, the analogous damage function is \(\bar {DF}_{2} =e \bar {y}_{2}\).
1.3 Proof of Lemma 1
From the calculation of the difference we take \(\bar {\mathbf {p}}_{1} -\bar {\mathbf {p}}_{2} = -\frac {\mathbf {a} \mathbf {b}^{2} \mathbf {e}^{2}}{2 (1 +\mathbf {c})(4 (\mathbf {b} -1)^{2} (1 +\mathbf {c}) +\mathbf {b}^{2} \mathbf {e}^{2}}\) and it is straightforward that it is a negative result since the numerator and the denominator is positive. Thus, the price is lower under the ex-ante case. Also, we calculate \(\bar {\mathbf {q}}_{1} -\bar {\mathbf {q}}_{2} =\frac {\mathbf {a} \mathbf {b}^{2} \mathbf {e}^{2}}{2 (1 +\mathbf {c})(4 (\mathbf {b} -1)^{2} (1 +\mathbf {c}) +\mathbf {b}^{2} \mathbf {e}^{2}}\) which is positive since both numerator and denominator are positive.
1.4 Proof of Lemma 2
We calculate \(\bar {k}_{1} -\bar {k}_{2} =\frac {a b^{3} e^{3}}{4 (b -1) (1 +c) (4 (b -1)^{2} (1 +c) +b^{2} e^{2})}\) where the denominator is negative since b ∈ (0, 1), thus the technology is “greener” or less polluting under the ex-ante case. Furthermore, \(\bar {{\Pi } }_{1} -\bar {{\Pi } }_{2} = -\frac {a^{2} b^{4} e^{4}}{16 (b -1)^{2} (1 +c)^{2} (4 (b -1)^{2} (1 +c) +b^{2} e^{2})}\) which is negative (both numerator and denominator are positive) since there is a negative sing in front of the ratio. Hence, the level of the profitsis lower under the ex-ante case.
1.5 Ex-ante Scenario - Oligopoly
1.5.1 Stage 2: Firms Decide on Output
We calculate the First Order Conditions (FOCs)Footnote 20\(\frac { \partial {\Pi }_{i}}{ \partial q_{i}^{ \ast }} =a -2 q_{i} (1 +c_{i}) -q_{j} = 0\) and solving simultaneously with respect to qi we take
where the superscript EA indicates the first scenario (ex-ante).
1.5.2 Stage 1: Regulator Decides for Technology
The Social Welfare is given by SWEA = b(CSEA − DFEA) + (1 − b)PSEA where \(C S^{E A} =\frac {1}{2} \overset {2}{ \sum _{i = 1}} \bar {q}_{i}^{E A}\), \(D F^{E A} =e (k_{i} \bar {q}_{i}^{E A} +k_{j} \bar {q}_{j}^{E A})\) and \(P S^{E A} =\overset {2}{ \sum _{i = 1}} {\Pi }_{i}^{E A}\) and from the FOC we obtainFootnote 21
yielding the optimum technology
After the necessary substitutions the profits are
and the price is
The emissions are given by \(\bar {y}_{i}^{E A} =\bar {q}_{i}^{E A} \bar {k}_{i}^{E A}\) and \(D F^{E A} =e \bar {y}_{i}^{E A}\). As usual we substitute the above equation into the SWEA and we take the final \(\bar {SW}^{EA}\).
1.6 Ex-post Scenario
1.6.1 Stage 2: Regulator Decides for Technology - Oligopoly
Like in the basic model, the regulator will decide on the level of the technology which maximises the social welfare. The FOC is equal to:Footnote 22
and solving simultaneously we have
where the superscript EP indicates the ex-post case.
1.6.2 Stage 1: Firms decide on output
After the substitution of \(k_{i}^{E P}\) into the profit’s equation we have \({\Pi }_{i}^{E P} =q_{i} (a +(-1 -c_{i} -\frac {b^{2} e^{2}}{4 (b -1)^{2}}) q_{i} -q_{j})\) and the FOCs areFootnote 23
where the optimum level of output is
where G = b − 1, F = 3 + 4cj + 4ci(1 + cj). Moreover, the optimum level of technology (after the substitution) equals \(\bar {k}_{i}^{E P} =\frac {2 a G^{3} b (1 + 2 c_{j}) e +a G b^{3} e^{3}}{4 G^{4} F + 4 G^{2} b^{2} (2 +c_{i} +c_{j}) e^{2} +b^{4} e^{4}}\) and similar we take the level of the emissions \(\bar {y}_{i}^{E P} =\bar {q}_{i}^{E P} \bar {k}_{i}^{E P}\), the damage equation \(D F^{E P} =e \bar {y}_{i}^{E P}\), the price \(\bar {p}_{i}^{E P} =a -\bar {q}_{i}^{E P} -\bar {q}_{j}^{E P}\), the profits \({\Pi }_{i}^{E P} =\bar {q}_{i}^{E P} (a +(-1 -c_{i} -\frac {b^{2} e^{2}}{4 (b -1)^{2}}) \bar {q}_{i}^{E P} -\bar {q}_{j}^{E P})\) and the social welfare \(\bar {SW}^{EP}\) (the last results are characterised by complex and long equations).
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Asproudis, E., Khan, N. & Korac-Kakabadse, N. Game of Regional Environmental Policy: Europe and US. J Ind Compet Trade 19, 1–20 (2019). https://doi.org/10.1007/s10842-018-0274-7
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DOI: https://doi.org/10.1007/s10842-018-0274-7