system
Given the following post, respond as if you're commenting on Reddit:
human
A small thought experiment on what is a rational consumer

Suppose everyone in this world is a rational consumer. There are two e-commerce company Amazon and Flipkart. Amazon starts to offer lower prices across the board. Everyone being a rational consumer, starts buying from Amazon exclusively. This drives Flipkart out of business leading to Amazon's monopoly. So, were the consumers rational? Can people ever be rational consumer?

Edit: I think I should elaborate what my definition of rational was a bit more. By rational I ment a consumer that only looks at his budget and the price to performance ratio of a product. Other factors like brand value and asthetics do not matter if the performance of the product is satisfactory.
gpt
That depends on how you define 'rational'. The term has a number of different definitions in economics, for example in consumer choice theory, 'rational' focuses on customers' preferences meeting certain technical criteria such as being complete, transitive, etc. In 'rational expectations', the rational means not making systematic errors and originally was used in contrast to 'adaptive'. 

It certainly can be rational to consider the long term impacts of your actions.