Fruits and Vegetables Versus Assets in Demand

There is a way in which fruits and vegetables and financial products are opposites: when quantities are high for fruits and vegetables, quality is high, and prices are low. With financial products, when issuance is high, quality is low, and pricing is expensive, leading to poor future returns from lower yields, and higher future defaults. I offer this for what it is worth, but is there something more to it, than the seeming oppositeness?  Why are they opposites?