Triple witching hour is the last hour of the stock market trading session on the third Friday of every March, June, September, and December. Those days are the expiration of three kinds of securities...

Qualified dividends, as defined by the United States Internal Revenue Code, are ordinary dividends that meet specific criteria to be taxed at the lower long-term capital gains tax rate rather than at higher tax rate for an individual's ordinary income. The rates on qualified dividends range from 0 to 23.8%.

Qualified Domestic Institutional Investor, also known as QDII, is a scheme relating to the capital market set up to allow financial institutions to invest in offshore markets such as securities and bonds. Similar to QFII, it is a transitional arrangement which provides limited opportunities for domestic investors to access foreign markets at a stage where a country/territory's currency is not traded or floated completely freely and where capital is not able to move completely freely in and out of the country.

Quality management ensures that an organization, product or service is consistent. It has four main components: quality planning, quality assurance, quality control and quality improvement. Quality management is focused not only on product and service quality, but also on the means to achieve it. Quality management, therefore, uses quality assurance and control of processes as well as products to achieve more consistent quality.

Quantitative easing, also known as large-scale asset purchases, is an expansionary monetary policy whereby a central bank buys predetermined amounts of government bonds or other financial assets in order to stimulate the economy and increase liquidity. An unconventional form of monetary policy, it is usually used when inflation is very low or negative, and standard expansionary monetary policy has become ineffective. A central bank implements quantitative easing by buying specified amounts of financial assets from commercial banks and other financial institutions, thus raising the prices of those financial assets and lowering their yield, while simultaneously increasing the money supply. This differs from the more usual policy of buying or selling short-term government bonds to keep interbank interest rates at a specified target value.

In monetary economics, the quantity theory of money states that the general price level of goods and services is directly proportional to the amount of money in circulation, or money supply.

A quartile is a type of quantile. The first quartile is defined as the middle number between the smallest number and the median of the data set. The second quartile is the median of the data. The third quartile is the middle value between the median and the highest value of the data set.

A quasi-contract is a fictional contract recognised by a court. The notion of a quasi-contract can be traced to Roman law and is still a concept used in some modern legal systems.

Queueing theory is the mathematical study of waiting lines, or. A queueing model is constructed so that queue lengths and waiting time can be predicted. Queueing theory is generally considered a branch of operations research because the results are often used when making business decisions about the resources needed to provide a service.

In finance, the acid-test or quick ratio or liquidity ratio measures the ability of a company to use its near cash or quick assets to extinguish or retire its current liabilities immediately. Quick assets include those current assets that presumably can be quickly converted to cash at close to their book values. It is the ratio between quick or liquid assets and current liabilities.

In United States securities law, the quiet period has "historically [meant], a quiet period of time extended from the time a company files a registration statement with the SEC until SEC staff declared the registration statement effective. During that period, the federal securities laws limited what information a company and related parties can release to the public."

An action to quiet title is a lawsuit brought in a court having jurisdiction over property disputes, in order to establish a party's title to real property, or personal property having a title, of against anyone and everyone, and thus "quiet" any challenges or claims to the title.