There is no mathematically sound explanation for that. It was plain to see Nixon's purpose was to destroy unions at the time. And it had to be an overwhelming

There is no mathematically sound explanation for that. It was plain to see Nixon's purpose was to destroy unions at the time. And it had to be an overwhelming salvo, or there could be no guarantee it would outlast his crooked regime. Turns out it has lasted longer than anyone would have wanted, so you get nothing but finger-pointing after a few decades, mainly by people who were not even there or into financial math at the time.