• Deprecated function: Optional parameter $path declared before required parameter $arg is implicitly treated as a required parameter in include_once() (line 1439 of /var/www/quickstart.cals.arizona.edu/includes/bootstrap.inc).
  • Deprecated function: http_build_query(): Passing null to parameter #2 ($numeric_prefix) of type string is deprecated in media_oembed_default_callback() (line 64 of /var/www/quickstart.cals.arizona.edu/profiles/ua_quickstart/modules/contrib/media_oembed/plugins/providers/default.inc).

Supply and Demand Terminology

What is the difference between a change in demand and a change in the quantity demanded? The terminology can be confusing — but we’ll provide some clarity in this video. In short, a change in demand refers to a shift in the demand curve — caused by a number of factors such as income, population, etc. A change in quantity demanded refers to a movement along a fixed demand curve — caused by a change in price.