A market is said to be in equilibrium if the supply and demand curve intersects.
<u>Explanation</u>:
A supply of a certain product meets the demand of that product i.e., if the "supply" and "demand" of the product is equal, then the market is at "equilibrium". The price corresponding to it is then called a market-clearing price or equilibrium price whereas the quantity is known as the equilibrium quantity. But this comes with two conditions of surplus and shortage when there is a change in the supply and demand curve. So, a market to be at equilibrium having an equilibrium price, it is always important that the supply meets the demand.
According to Hindu tradition, the source of the Ganges River is the god Shiva's hair (D).
This is a personal question, which means that only you can answer it. However, I can give some examples that might help guide your work.
An example of a primary source that you might encounter in your own life is that of a news article. As this article is likely to be written by a reporter witnessing the events, it can be considered a primary source. On the other hand, an example of a secondary source would be a non-fiction book that talks about a historical event. This is because such a book would give a second-hand account of an event based on historical information.
The McCulloch v. Maryland is the case that went to the Supreme Court because the state of Maryland wanted to tax the National Bank established by the Congress. The court ruled that under the Article I, Section 8, the "Necessary and Proper" clause that the state could not tax the institution of the the federal government. This is an landmark case and its effect was that this supported the federal government over the state governments.