In many cases, pioneers lose their market lead and initial market share to imitators who:

The correct answer is, Who make better substitutes.

Explanation:

In many cases, pioneers lose their market lead and initial market share to imitators who make better substitutes. Pioneers usually don't focus much on the quality of the product they offer because of the mind set that they are the ones who have captured the whole market and people are satisfied with them, but actually when people find a better substitute of pioneer's product, they switch to that new company and in this way pioneers lose their market lead and initial market share.

u = 30

continuing your method

= +

subtract from both sides

= - thus

= -

= ⇒ u = 30