Abstract
<p>On this approach, some techniques to measure the informal economy, has been analysed, in particular, was used for example the direct methods to measure informal economy, using in particular the Informal GDP as reference, many techniques proposed in this approach, are relative with the reality of the Angola informal economy. In general the informal economy represents the most incapacities of institutions to guarantee a strong regulation of economy and other consequences are related with inexistence of industrial capacity and productivity, which impulses, for example, the informal economy to grow up, the inexistence of appropriate government institutions, that can collect in particular the data, constitute a strong incapacity of informal economy. The majority informal economy, means for example, existence of loss taxes on taxes system, in this approach proposed a significant method to measure the percentage of taxes are losses, it's, considering that, high presence of informal economy promote naturally high level of loss taxes, in particular, aligned with high Inefficiency of economic institutions for example. The methods relative to the proportion of informal workers in the economy are evidenced, that can provide the percentage of workers are naturally in informal economy and practices the many informal activities, in Angola for example, more than 60% of workers are from informal economy.</p>