Simplify the following text for a Grade 11 native English-speaking person.
Original: It is necessary to commission ( hire ) market research ( generally desk\/secondary research , although sometimes primary research ) to estimate the total market size and a company 's market share .
Simplified: It is generally necessary to commission market research ( generally desk\/secondary research ) to determine . Sometimes , though , one can use primary research to estimate the total market size and a company 's market share .