Because various functions concentrate excessively in the Metropolitan Area, external diseconomies problems occur. One way of solving these problem is telecommuting. Telecommuting entails the partial or total substitution of the trip to the workplace. In this study making use of the model of urban economics we formulate the effect of telecommuting. We find the conditions necessary for the spread of telecommuting. There are shown to depend on cost decreases. And we estimate the effect of the spread of telecommuting in the metropolitan area.