Why did the growth of trade and industry weaken feudalism?

Peasants left manors for towns where they could find work.
The rise of a merchant class weakened the power of monarchs.
Feudal manors switched from agriculture to manufacturing.
Agriculture stopped being profitable because merchants imported food.

Peasants leaving manors for towns where they could find work weakened feudalism because it reduced the labor force available to manors, making it difficult for lords to maintain their economic and social power. Additionally, the rise of a merchant class created a new source of wealth and influence that challenged the traditional feudal hierarchy. Feudal manors switching from agriculture to manufacturing also played a role in weakening feudalism by shifting economic power away from the landowning nobility. Furthermore, the importation of food by merchants made agriculture less profitable for many feudal landowners, further eroding the traditional economic basis of feudal society.