Walmart is robotic janitors in some of its stores. Walmart has purchased several Autonomous Cleaner (Auto-C) robots from Brain Corporation. An Auto-C robot looks like a Zamboni, the machine used to clean ice rinks. The robots scrub floors and clean store aisles. Sensors in the robots allow them to navigate around customers and other objects, so the robots can be used during store operating hours.

Management at Walmart has stated that the robots are to be used to free up employee time. Management reasons that if the robots do the repetitive tasks, employees will be better able to help shoppers and do other tasks. Management estimates that an employee at each store with the Auto-C robot would have spent two hours per day doing the cleaning that the Auto-C will perform.

Walmart is also using Auto-S robots in its stores, which scan shelves in the stores to help keep track of inventory that is out of stock, mislabeled, or priced incorrectly. The Auto-S robots are three times as fast as humans and twice as accurate.

In addition, Walmart is using conveyor belt robots that sort products from trucks as they are unloaded. The conveyor belts cut the number of employees needed in the unloading process in half.

Approximately 50% of Walmart's workforce is part time, up from 20% in 2017 (Reuters(Links to an external site.)

.) Walmart raised the minimum wage in its stores to $11 in 2018. Walmart employs more than 2 million people worldwide.

Questions

1. Do you think that the costs of robots are mostly variable or fixed?
2. Would the cost of full-time hourly employees behave mainly as a variable cost or a fixed cost? Does your answer change if you consider part-time hourly employees rather than full-time employees?