I'm not sure your proposed solution will work unless we assume people exclusively send signal X or Y. Whoever is subsidizing people to send signal Y needs to have some relatively simple process of identifying the people they want to subsidize to send signal Y. In the MIT degree example you gave the process was simply selecting people who were already sending signal X, but you could also try to identify individuals who have an obviously high Z.
Since the subsidizer can identify people who should be subsidized, then so can I as an employer. If you come to me with signal Y, then I will check whether you are likely to... (read more)
I'm not sure your proposed solution will work unless we assume people exclusively send signal X or Y. Whoever is subsidizing people to send signal Y needs to have some relatively simple process of identifying the people they want to subsidize to send signal Y. In the MIT degree example you gave the process was simply selecting people who were already sending signal X, but you could also try to identify individuals who have an obviously high Z.
Since the subsidizer can identify people who should be subsidized, then so can I as an employer. If you come to me with signal Y, then I will check whether you are likely to... (read more)