Paul Krugman writes that taxpayers should receive equity in exchange for large cash infusions into the nation’s banks. He is correct. Existing shareholders should suffer a loss of their equity positions in companies that failed spectacularly and at great cost to the economy.

So banks need more capital. In normal times, banks raise capital by selling stock to private investors, who receive a share in the bank’s ownership in return. You might think, then, that if banks currently can’t or won’t raise enough capital from private investors, the government should do what a private investor would: provide capital in return for partial ownership.

But bank stocks are worth so little these days — Citigroup and Bank of America have a combined market value of only $52 billion — that the ownership wouldn’t be partial: pumping in enough taxpayer money to make the banks sound would, in effect, turn them into publicly owned enterprises.

My response to this prospect is: so? If taxpayers are footing the bill for rescuing the banks, why shouldn’t they get ownership, at least until private buyers can be found? But the Obama administration appears to be tying itself in knots to avoid this outcome.