If Johnson comes home from Brussels having failed to secure a deal, the UK government is legally required to ask Brussels for another delay that would push the Brexit deadline beyond October 31. That would set the stage for a general election, and potentially, another referendum that would give British voters the chance to call the whole thing off.

"At this stage, it remains more likely that Brexit will be delayed again to make way for a snap election and/or a second referendum in the next months," analysts at Berenberg bank wrote on Friday.

Mind the pound: Market reaction could be strong, depending on how events unfold. News of progress in negotiations at the end of last week helped send the pound near $1.27, its highest level since June.

Costco's $4.99 rotisserie chicken comes at a huge price

We think last week's most interesting story was about chicken. Yes, chicken.

Costco sells rotisserie chickens for $4.99. A good deal, right? But the chickens do more: They pull customers into stores and get them to browse the aisles.

The chickens have become almost a cult item. 91 million were sold last year, double the number from a decade earlier. They have their own Facebook page.

So Costco is willing to go to extreme lengths to keep its chickens at $4.99. For the past few years, it's been recruiting farmers for this moment: The official opening of a sprawling, $450 million poultry complex of its very own in Nebraska.

Costco will control the production process from farm to store, making key decisions down to the grain chickens eat and the type of eggs hatched. It's one of the largest-scale tests of a store's ability to become its own meat supplier. And there's no guarantee it will work.