Just wondering what 15,000 gallons of petroleum would be worth in gold and precious metals if you were a Mr Big of the post apocalyptic world? What would you trade for the fuel? It is being delivered by tanker convoy soon and you have about 5,000 tonnes of gold and silver to barter with. Ancillary trade goods are bullets, slaves and machine-parts. You have scant reserves of fuel and it is precious. You don't lack for food, but are not trading a surplus either.... The noise of the convoy approaches and your go-between broker is waiting for an answer. As merchant king you aren't going to turn down the deal of a lifetime, but you don't want to give away too much gold. Or do you? The options Nearly all your gold and silver - Very likely to get the fuel, plus a lasting shipment for several years. A very good chance of a permanent trade-treaty. Three quarters of your gold and silver - Likely to get the job done, chance of a future trade-treaty also. Half of your gold and silver - Possible to get one of the 7,000 gallon tankers worth of fuel, but not both. A quarter of your gold and silver - Unlikely to get much, it could well anger the convoy leader! Slaves and machine parts - Dubious trade for an unlikely agreement. Perhaps it'll soften up the men wanting wives for back home? It could also arose their anger at such offerings. You rub your hands and think more on this... A hail of lead! - This is risky, the convoy is well guarded with both troops AND tracked vehicles A mixture of precious metals, slaves and machine-parts - A balanced gesture, likely to get negotiations going, at the expense of a decisive outcome.