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главный фактор stresses
gen.	critical factor
biol.	primary factor
busin.	driving factor (Alex_Odeychuk)
econ.	prime driver (MichaelBurov)
fin.	determinant
Makarov.	prime factor
math.	general factor; key factor; chief factor (группы)
math., alg.	principal factor
nano	pacing factor
oil	controlling factor

главный фактор: 15 phrases in 5 subjects

Economy	4
General	2
Mathematics	4
Production	4
Public relations	1