Final answer:
It is true that similar firms like FedEx and UPS with common markets are direct competitors, engaging in intense rivalry within the package delivery industry. Competition evidence includes aggressive marketing, price competitions and constant innovation.
Step-by-step explanation:
It is true that two firms, such as FedEx and UPS, that have similar resources and common markets would be direct and mutually acknowledged competitors. These businesses operate in the highly competitive package delivery industry, where they constantly vie for market share, innovate in logistics, and improve customer service to outdo each other.
Evidence of serious competition between firms can include aggressive marketing campaigns, price wars, frequent introduction of new or improved services, and expansion into new markets. Two industries known for their high levels of competition are the smartphone industry, with key players like Apple and Samsung, and the airline industry, where numerous airlines compete on routes, pricing, and passenger experience.