Why does the Audi A1 have a smaller engine compared to other models?

I noticed that the Audi A1 has a smaller engine compared to other models from the same brand. Is there a specific reason for this choice?

The Audi A1 is a compact car designed for city driving, which is why it has a smaller engine. This makes it more fuel-efficient and easier to maneuver in tight spaces.

Having a smaller engine in the Audi A1 also means it has a lower starting price compared to other models, making it more accessible to those on a budget.

Audi has focused on optimizing the performance of the smaller engine in the A1, ensuring that it still delivers a smooth and powerful driving experience.