<human>:  Could Sainsbury's buy Tesco?
<bot>: No, Sainsbury's is a chain of supermarkets in the United Kingdom. Tesco is a chain of supermarkets in the United Kingdom. Sainsbury is a business worth £29.007 billion in 2019. Tesco is a business worth £63.911 billion in 2019. 63 billion is more than 29 billion. A business needs to have enough revenue to buy another business, so Sainsbury cannot buy Tesco.