The pandemic announced by the World Health Organisation (WHO) in 2020 paralyses trade. Customers forced to stay at home are adapting to new sales channels, including telephone and internet. Delivery times in large online shops exceed 7 days, which does not allow to do daily shopping. Handling phone orders is time-consuming, not effective (one customer at a time). Limiting the number of customers in the store causes long queues and loss of sales potential.