Final answer:
To shift the vertical supply curve to the left, a breakdown of key market institutions would have to occur.
Step-by-step explanation:
In order to shift the vertical supply curve to the left, a breakdown of key market institutions would have to occur. This is because the institutions play a crucial role in facilitating the functioning of markets and ensuring efficient allocation of resources. When these institutions break down, it can disrupt the market mechanisms and lead to a leftward shift in the supply curve.