A hiatal hernia occurs when the upper part of your stomach pushes up through your diaphragm and into your chest region. The diaphragm is a large muscle that lies between your abdomen and chest. You use this muscle to help you breathe. Normally, your stomach is below the diaphragm, but in people with a hiatal hernia, a portion of the stomach pushes up through the muscle. The opening it moves through is called a hiatus. This condition mostly occurs in people who are over 50 years old.
A commodity generally refers to an agricultural product that is bought and sold such as corn, coffee, wheat, etc. Energy commodities include gas, electricity, oil, etc.
An example of a heterogeneous product is the car. On the other hand, homogeneous products are basically the same in all ways and each can serve as a perfect economic substitute for the other. Commodity goods, such as fruits and precious metals, are good examples.he existence of heterogeneous products means that the market is imperfect and it will be difficult for a consumer to discern the relative value between two products such as two different mid-sized cars.