I'd guess that means that there is a market of unofficial jobs in your country and the description says that they either contribute to your pension at full scal

I'd guess that means that there is a market of unofficial jobs in your country and the description says that they either contribute to your pension at full scale or at some degree by reporting your salary for tax services lower than it is. In my country half the companies do either of these cause all the taxes on the behalf of the workers and pension contributions are done by them, not the workers.