Amazon CEO Andy Jassy says inventing and 'riffing' on ideas is easier if staff are back in the office

• Amazon CEO Andy Jassy said inventing is "easier" when staff are working in the office.
• "The energy and riffing on one another's ideas happen more freely" than from home, he said.
• Staff must work three days a week in the office from May, but some buildings won't be ready then.

Amazon CEO Andy Jassy said inventing is "often messy" and "easier" when staff are not working from home after telling employees to return to the office three days a week. 

He said it's more efficient to create and collaborate when workers are together in person, and that "serendipitous interactions" help innovation.