 How was Johnson convinced to buy the case astroid fever medication?
When Harvey staggered pontifically into the battered metalloy saloon—the only one on Planetoid 42—his tall, gangling partner was already stumbling out, mouthing something incoherent. The interplanetary con-men drank noisily, asked for more, until they had drunk eight glasses. Medical science is unanimous in proclaiming this magic medicine the sole panacea in the entire history of therapeutics." "And chief of police, no doubt," said Harvey jocosely. "On account of the quantity, I'm able to quote a bargain price. Then Johnson rubbed his thumb on his index finger and wetted his lips expectantly. "Johnson, as I saw instantly, is the victim of a difficult environment, and must charge accordingly."
 Joe's acting skills
 Proven statistics showing that it was the best antidote  Joe's acting skills  He felt feverish and thought he may have contracted the illness  A price too good that could not be turned down