My conclusion is simply that the going rate (market clearing price) for TPS writers is 50 groats a year, meaning that our TPS clerk can expect 50GPY for his lab

My conclusion is simply that the going rate (market clearing price) for TPS writers is 50 groats a year, meaning that our TPS clerk can expect 50GPY for his labor. Since the employee gets 10GPY from the state, the company now only needs to pay him 40GPY to ensure he's equally well compensated. The money for BI has to come from somewhere, so I don't think it's a plausible conclusion that salaries would stay the same while everyone gets a chunk of extra money from the state. Further support comes from the rationality of employers who would prefer to ensure employees were equally paid in total in both a no-BI and BI scenario. I think your point is that declining marginal utility of income in a BI scenario means that companies have to pay proportionately more to make up for the decline in utility caused by everyone having more income. I don't have what I assume is your background in economics to argue that point with theory, but it fails a basic plausibility test for me: your claim is that it's more likely that employers will pay more in direct salaries to workers who are receiving money from the state than it is that they will pay less. It doesn't hold up in today's world either: compare salaries in Scandinavian countries, where the state provides huge benefits to citizens against the USA where there is essentially no support from government.