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# Directed Search with Endogenous Search Effort.

Directed Search with Endogenous Search Effort.

## Figure 1: CDF of wage

Figure 1: CDF of wage o¤ers. Firms react to the number of applications that agents send. If agents send a single application, …rms will not have incentives to o¤er more than the reservation wage. The increase in the number of applications rises the probability that an agent has more that one o¤er. This drives the wage o¤er distribution closer to its limiting value. An increase in the number of applications moves to the right the upper bound of the distribution. The distribution related to a particular number of applications stochastically dominates all distributions corresponding to fewer applications. The wage o¤er distribution converges to the limiting distribution: lim B(W ) = 1 Q w S!1 ln Q W for W 2 [w; w] (13) If the agents send an in…nite number of applications the probability of receiving a particular number of applications can be expressed as a Poison distribution. This approach is followed by Halko, Kultti and Virrankoski (2008). Here I am interested in the problem related to the choice of search e¤ort. Agents will not make an in…nite number of applications. 9

2.3 Search e¤ort Agents maximize the expected return corresponding to the number of applications S. They take into account the cost of applications and the behavior of the rest of the society. Agents observe the market tightness and give their best response to a scenario where the rest of agents make a …xed number of applications S. Firms o¤er wages according to B(W ) that is related to S. Agents are concerned about the highest o¤er they receive, since this will be the o¤er they will accept. Agents then compute H(W ), the cumulative distribution function of the highest o¤er received, that can be constructed as: H(w W ) = that is equivalent to: SX i=1 S i O(S; ) i (1 O(S; )) S i B(w W ) i , (14) H(W ) = (1 O(S; )) + O(S; )B(W ) S (1 O(S; )) S . (15) However this is not the wage of agents yet. Agents have an outside option. If they do not receive any o¤er, they earn the reservation wage. The cumulative distribution function of the wage associated to S applications is: 7 R(W ) = (1 O(S; )) + O(S; )B(W ) S for W 2 [w; w]. (16) Plugging B(W ) in this function I get: S Q w R(W ) = (1 O(S; )) S S 1 . (17) Q W The distribution of the wage that agents perceive, for …xed S = 20, = 1, Q = 1, w = 0, is: 7 The return takes into account that the agent will receive the reservation wage if there are no o¤ers. 10

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