Dany sets off to buy her robot slave army. She takes a lot of cargo along from the ships, and a dragon.
It strikes me that barter is awfully inefficient. All those goods and a dragon buys 8600 unsullied plus extra boys. But is that the right price? Would it not have been better to exchange all the goods for gold coins, and then haggle over the price in gold coins? Because there might be people willing to pay more for dragons and other goods than those slavers were. That's why money was invented, after all. But clearly Astapor is not as sophisticated as that yet. Or Dany has been ripped off.
She gets her own back, though. Boy, does she get her own back. In what I can only imagine will be a very good scene in the TV series, having bought the unthinkingly obedient slave army, she crosses the figurative Trident (not the Rubicon) and proceeds to use it to...attack the slavers. Genius! It's the sort of plan only a self-righteous teenage girl would attempt, and it's beautiful. She gets to keep her dragon, too.
I'm still worried about logistics. Will Dany have enough people to command the robot slaves? And will she be able to find sufficient food and shelter for them? I'm a bit worried she has not thought this part through. Then again, she may well have new people on her side now that she is something of a power.