What day of the week is most important in a business-regarding number of customers, productivity of employees,?

etc.

Give an analysis on the days and what you think would be the most important day for a business with regard to revenue and productivity and why.

the middle of the work week is when workers are most productive. I this research paper on it ( pdf )

http://cep.lse.ac.uk/pubs/download/mhrldp0004.pdf