What group of elements does the shaded area in the following periodic table indicate? 
Definitions:
Firms
Business entities engaged in commercial, industrial, or professional activities, with the goal of earning a profit.
College Textbook Publishers
Companies specialized in publishing textbooks tailored for college and university level courses.
Cutthroat Competition
A situation in which businesses aggressively compete with one another by cutting prices and attempting to eliminate competitors in the market.
Oligopoly
A market structure characterized by a small number of large firms dominating the industry, leading to limited competition.
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