Murabaḥah is a term for a sales contract where the buyer and seller agree on the markup, the ratio between the cost of a good or service and what?
Markup (business) Markup is the ratio between the cost of a good or service and its selling price. It is expressed as a percentage over the cost. A markup is added onto the total cost incurred by the producer of a good or service in order to cover the costs of doing business and create a profit. The total cost reflects the total amount of both fixed and variable expenses to produce and distribute a product. Markup can be expressed as a fixed amount or as a percentage of the total cost or selling price. Retail markup is commonly calculated as the difference between wholesale price and retail price, as a percentage of wholesale. Other methods are also used.
Muktzeh Muktzeh (Hebrew: מוקצה; also transliterated as muktzah, and either spelling without the ending -h) is a Hebrew word that means "separated", or "set aside". The generally accepted view regarding these items is that they may be touched though not moved during Shabbat (the Jewish Sabbath) or Yom Tov (Jewish holiday). Some extend this prohibition to the actual handling of these items. Halakha defines various categories of objects or substances which are "set aside" on the Jewish Sabbath, as well as various permissible instances of moving these various "muktzeh" items. For example, one may not handle money, rocks, twigs, etc. on Shabbat, as these items are "muktzeh".