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The '''Harris–Todaro model''', named after [[John R. Harris]] and [[Michael Todaro]], is an economic model developed in 1970 and used in [[development economics]] and [[welfare economics]] to explain some of the issues concerning rural-urban [[Human migration|migration]]. The main assumption of the model is that the migration decision is based on expected income differentials between rural and urban areas rather than just wage differentials. This implies that rural-urban migration in a context of high urban unemployment can be economically rational if expected urban income exceeds expected rural income.
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==Overview==
In the model, an [[Economic equilibrium|equilibrium]] is reached when the expected wage in urban areas (actual wage adjusted for the [[unemployment]] rate), is equal to the [[marginal product]] of an agricultural worker. The model assumes that unemployment is non-existent in the rural agricultural sector. It is also assumed that rural agricultural production and the subsequent labor market is [[perfect competition|perfectly competitive]]. As a result, the agricultural rural wage is equal to agricultural marginal productivity. In equilibrium, the rural to urban migration rate will be zero since the expected rural income equals the expected urban income. However, in this equilibrium there will be positive unemployment in the urban sector.
 
==Formalism==
The formal statement of the equilibrium condition of the Harris–Todaro model is as follows:
*Let w<sub>r</sub> be the wage rate (marginal productivity of labor) in the rural agricultural sector.
*Let l<sub>e</sub> be the total number of jobs available in the urban sector, which should be equal to the number of employed urban workers.
*Let l<sub>us</sub> be the total number of job seekers, employed and unemployed, in the urban sector.
*Let w<sub>u</sub> be the wage rate in the urban sector, which could possibly be set by government with a minimum wage law.
 
Rural to urban migration will take place if:
:<math>\ w_r < \frac{l_e}{l_{us}} w_u </math>
 
Conversely, urban to rural migration will occur if:
:<math>\ w_r > \frac{l_e}{l_{us}} w_u </math>
 
At equilibrium,
:<math>\ w_r = \frac{l_e}{l_{us}} w_u </math>
 
With the random matching of workers to available jobs, the ratio of available jobs to total job seekers gives the probability that any person moving from the agricultural sector to the urban sector will be able to find a job. As a result, in equilibrium, the agricultural wage rate is equal to the expected urban wage rate, which is the urban wage multiplied by the employment rate.
 
==Conclusions==
Therefore, migration from rural areas to urban areas will increase if:
*Urban wages (w<sub>u</sub>) increase in the urban sector (l<sub>e</sub>), increasing the expected urban income.
*[[Agricultural productivity]] decreases, lowering marginal productivity and wages in the agricultural sector (w<sub>r</sub>), decreasing the expected rural income.
 
Rural to urban migration causes overcrowding and unemployment in cities as migration rates exceed urban job creation rates, with many people ending up in unproductive or underproductive employment in the [[informal sector]]. However, even though this migration creates unemployment and induces informal sector growth, this behavior is economically rational and utility-maximizing in the context of the Harris–Todaro model. As long as the migrating economic agents have complete and accurate information concerning rural and urban wage rates and probabilities of obtaining employment, they will make an expected income-maximizing decision.
 
==Limitations==
One limitation of this model is that it assumes potential migrants are [[risk neutral]], as in they are indifferent between a certain expected rural income and an uncertain expected urban income of the same magnitude. This assumption's reflection of economic realities is questionable; poor migrants will likely be risk averse and require a significantly greater expected urban income to migrate. However, the Harris–Todaro model can be adjusted to reflect risk aversion through alteration of the expected urban income calculation. When the model assumes risk aversion instead of risk neutrality, the results are virtually identical.
 
==References==
*{{Citation |last=Harris |first=John R. |first2=Michael P. |last2=Todaro |lastauthoramp=yes |year=1970 |title=Migration, Unemployment and Development: A Two-Sector Analysis |journal=[[American Economic Review]] |volume=60 |issue=1 |pages=126–142 |doi= |jstor=1807860 }}.
 
{{DEFAULTSORT:Harris-Todaro model}}
[[Category:Economics models]]
[[Category:Development]]

Latest revision as of 22:27, 10 April 2014

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