Answer:
The Competitive-parity method
Explanation:
The competitive parity method refers to an advertisement expense budgeting method wherein, a firm budgets or plans it's own advertisement expenditure which is based upon the estimated advertisement expenditure of it's competitors.
Under the method, the budget allocated for advertisement by a firm is set at par with those of the competitors.
The drawback of such a method being it's assumption of all firms having same marketing objectives. Also herein, if the competitor commits a mistake w.r.t it's budget, consequently the same mistake shall accrue to the firm following it.
In the given case, the owner learnt of his competitor's advertisement budget being $150,000, post which he immediately set the budget of his own company as $150,000. The method of promotional budgeting conveyed here is, the competitive-parity method.