Abstract
In multi-period environments, the presence of strategic consumers induces monopolist retailers to inter-temporally compete with themselves. Targeting consumers with price-discount coupons is a proposed mechanism to overcome this inter-temporal competition. Targeting consumers with coupons can counteract strategic consumer behavior, but this mechanism cannot completely eradicate the negative implications imposed by the presence of such consumers. Additionally, the quality of information available (regarding the consumers’ valuations) may play an important role in the targeting decisions. Specifically, we illustrate how the retailer may absent completely from targeting efforts when the quality of information and the proportion of strategic consumers are sufficiently low. Lastly, we consider the optimal investment in information solicitation, demonstrating the trade-off between a low investment, which result in low quality of targeting capability, and a high investment which improves the effectiveness of the targeting efforts.
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Notes
See von der Fehr and Kühn (1995) for a discussion comparing and contrasting these results. The authors suggest that both are relevant depending on the practical assumptions.
Later in Sect. 4, we extend the analysis to include imperfect information about consumers’ valuations. In that case, there would (or could) be a difference between the actual valuations of consumers and their mapped valuation—those estimated valuations stored by the retailer.
\(\beta \) is defined later.
We note that this is a result of our implicit assumption the consumers’ valuations or utilities do not discount over time.
Another equilibrium, for example, which yields the same optimal revenue, is the following: \(p^*_1=\frac{3}{4}, c^*_1 = \frac{1}{4}, \gamma ^*_{1}=[\frac{1}{2},\frac{3}{4}], p^*_2=\frac{1}{4}\). In this case \(D_{1}^{{C}^*}\) is the set of all consumers with valuation in the range \([\frac{1}{2},\frac{3}{4}]\), and \(D_{2}^*\) is the set of all consumers with valuation in the range \(\big[\frac{1}{4},\frac{1}{2}\big].\)
While we are not able to achieve a closed form solution for the general case, we are able to obtain such when focusing on a market comprised only of strategic consumers. This instance, despite being supposedly simple, shows how intractable the expressions become, and sheds some light as to why we were not able to achieve a closed-form solution for the general case. Setting \(\alpha =1\) in Eq. 3 and solving we obtain: \(p_{2}={\left\{ \begin{array}{ll} {\frac{\left( \left( \frac{\tau _{3}}{\tau _{1}}\right) ^{2}* {\left( i\sqrt{3}+1 \right) }-{2\frac{\tau _3}{\tau _1}} \left( {2\tau _1+ \left( i\sqrt{3}-1 \right) \tau _2}\right) + \left( 1-i\sqrt{3} \right) {\tau _1^2}+ \left( i\sqrt{3} +1 \right) {2\tau _2\tau _1}-2{\beta }^{4}-44{\beta }^{3}-188{\beta }^{2} +1116\beta -450 \right) }{48\left( \beta -1\right) \left( \left( i \sqrt{3}-1 \right) {\frac{\tau _3}{\tau _1}}-i\sqrt{3}{\tau _1}+ 2{\beta }^{2}+4\beta -{\tau _1}-18 \right) } } &{}\text{ if } 0 \le \beta \le \left( \frac{5-\sqrt{17}}{2}\right) \\ \\ { \frac{\left( {\left( \frac{\tau _{3}}{\tau _{1}}\right) ^{2}}+{2\frac{\tau _3}{\tau _1}} \left( {\tau _1+\tau _2 }\right) + {\tau _1^2}+ {2\tau _2\tau _1}+{\beta }^{4}+22{\beta }^{3}+94{\beta }^{2}-558\beta +225 \right) }{ 48\left( \beta -1\right) \left( \frac{\tau _3}{\tau _1}+{\beta }^{2}+2\beta +{\tau _1}-9 \right) } }&{} \text{ otherwise } \end{array}\right. } \) and \(p_{1}-c_1={\left\{ \begin{array}{ll} {\frac{1}{96\beta -96} \left( {\frac{ \left( i\sqrt{3}-1 \right) \tau _3 }{\tau _1}}-i\sqrt{3}\tau _1+2{\beta }^{2}+16\beta -\tau _1-42 \right) }&{} \text{ if } 0 \le \beta \le \left( \frac{5-\sqrt{17}}{2}\right) \\ -\frac{1}{48}{\frac{\tau _3 + \tau _1 {\beta }^{2}+8\tau _1 \beta + \tau _1^{2}-21\tau _1}{\tau _1} \left( 1- \beta \right) }&{} \text{ otherwise } \end{array}\right. } \) where \(\tau _1=\root 3 \of {{\beta }^{6}+6{\beta }^{5}-123{\beta }^{4}+602{\beta }^{3}-513{\beta }^{2}+6\sqrt{-3\beta \left( {\beta }^{5}+6{\beta }^{4}-87{\beta }^{3}+368{\beta }^{2}-288\beta +216 \right) \left( {\beta }^{2}-5\beta +2 \right) ^{2}}-1080\beta +27}\), \(\tau _2=\left( {\beta }^{2}+11\beta -9 \right) \), and \(\tau _3=\left( {\beta }^{4}+4{\beta }^{3}-50{\beta }^{2}+144\beta +9 \right) \).
As noted for the perfect targeting settings, the presented solution is solution is not unique, however, the associated revenues are optimal.
How does the revenue change in \(\alpha \)? We have already seen that the revenue decreases as we replace myopic consumers with strategic consumers, while the adoption of coupons increases revenue by 25% when all consumers are myopic and growing to an increase of 33% when all consumers are strategic. Numerically, we can show that, not surprisingly, those transitions are monotone.
The cost of \(\beta \) can be facilitated in different ways. One may assume that when the firm decides to increase \(\beta \) then this is implemented uniformly across the population (that is, the improvement is applied for the entire range of consumers) and the resulting cost may be linear or quadratic in this value of \(\beta \). In that case, we find that the insights thus far persist and, in particular, we obtain qualitative results as depicted in Fig. 2; yet, the profit does not increase in \(\beta \) any longer and may be decreasing in \(\beta \), as is the case when the cost of improvement is \(0.5\beta ^2\) (implying that the firm’s optimal decision is no investment in information improvement), or it may be concave in \(\beta \) with a maximization within the range, as is the case when the cost of improvement is \(0.25\beta ^2\) (and accordingly the firm’s optimal decision when all consumers are strategic is to set the optimal investment in information improvement to \(\beta =0.29\)).
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Appendix: Proofs and additional statements
Appendix: Proofs and additional statements
In this Section we sketch the a proofs for Lemma 1 and Corollary 1. Proof of Proposition 1 can be found in Sect. I.B. (page 16) of Lazear (1986) and Proposition 2 can be trivially demonstrated. Proposition 3, and Proposition 4 are direct consequences of first order conditions and hence omitted.
Proof of Lemma 1
Recall that the Lemma states: In the Perfect Information case, \(\beta =1\), where consumers are myopic, \(\alpha =0\), targeting only the set of consumers with valuation in [\(p^*_1-c_1, p^*_2\)], i.e., \(\gamma _{1}=[p^*_1-c_1, p^*_2]\), achieves the optimal revenues. Where \(p^*_1 \text{ and } p^*_2\) are the the sub-game perfect equilibrium prices resulting in case all consumers behave rationally. In order to prove this Lemma we need to show that there is no benefit of offering a coupon to consumers outside of \(\gamma _{1}=[p^*_1-c_1, p^*_2]\). We use arguments regarding marginal contributions to do so We look at adding a small proportion of the population, of size \(\epsilon \ge 0\), to the set of targeted consumers. On the one hand, targeting consumers with valuation \(\gamma _{1}=[p^*_1-c_1-\epsilon , p^*_2]\) does not provide any added benefit, ceteris paribus, since the consumers added to the targeted population do not purchase the product as their valuation is less than \(p_1-c\). Using the same logic, targeting \(\gamma _{1}=[p^*_1-c_1, p^*_2+\epsilon ]\), means we provide a coupon to the population \([p^*_2, p^*_2+\epsilon ]\) to purchase the product at \(p^*_1-c_1\) instead of at \(p^*_2\), which in turns means we could have raised the second period price to \(p^*_2+\epsilon \) to the rest of the consumers, i.e., this can’t be optimal.
Proof of Corollary 1
This result is archived by construction of a pricing policy, which provides the retailer with the same optimal revenue she receives when facing myopic consumers. The construction is such that it is resistant to strategic consumer behavior. Given that the optimal pricing policy facing myopic consumers and N periods is: \(p_1\ge p_2 \ge ...\ge p_N\). As targeting is perfect, target, with coupon \(c_t\) the population with valuation: \(\gamma _t\) = [\(p_{N+1-t},p_{N-t}\)], and the coupon is such that the effective price in period \(c_t\) is \(p_1-p_{N+1-t}\), and this is for \(t \in {1,2,...,N}\). The constructed price is such that no consumer can rationally expect that he will face a lower price in the future, and as targeting is perfect, no consumers are offered a coupon that is not intended for their use. Essentially, as the desired the “skimming” policy is such that it refers to increasing valuations, countering the effects of strategic consumers.
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Hermel, D., Mantin, B. & Aviv, Y. Can coupons counteract strategic consumer behavior?. J Revenue Pricing Manag 21, 262–273 (2022). https://doi.org/10.1057/s41272-021-00325-y
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DOI: https://doi.org/10.1057/s41272-021-00325-y