For example a recession in the EU would cause a fall in demand for UK exports reducing our AD (EU accounts for 60% of our trade therefore is important). Also a recession in other countries would effect economic confidence if people see the US in a recession they are worried and will spend less.
It provides a means to create structured documents by denoting structural semantics for text such as headings, paragraphs, lists, links, quotes and other items. HTML elements are delineated by tags, written using angle brackets. Tags such as <img /> and <input /> introduce content into the page directly.
For readers unacquainted with either term, HTML is the set of codes (that's the markup language) that a writer puts into a document to make it displayable on the World Wide Web. HTML 4 is the current version of it. XML is a structured set of rules for how one might define any kind of data to be shared on the Web.