Final answer:
Chrysler's 1932 ad 'Look at All Three' compares its cars with those of General Motors and Ford, the two main rivals in the U.S. auto market known as the 'Big Three'. The competition among them led to better cars due to innovation and consumer-driven demands, which only intensified with the entry of international carmakers.
Step-by-step explanation:
The two main rivals referenced in Chrysler's 1932 Plymouth advertisement with the headline "Look at All Three" are General Motors and Ford. These two, in conjunction with Chrysler, were known as the "Big Three" auto manufacturers in the United States. During this time, competition among these companies was significant as they were the dominant players in the U.S. automobile market.
This competition, characterized by continuous innovation and responsiveness to consumer preferences, was crucial because it led to improvements in the quality of cars being produced. The arrival of additional competitors from Europe and East Asia later increased this competition, further pushing the American automakers to enhance their products.