What was the impact of the Lisbon Treaty on the EUs single market?

Your reading this week focusses on substantive concepts behind the EUs single market, the forms of integration prior to 1986 and the completion of the single market up to the present day, including changes introduced by the Lisbon Treaty and the abolition of the distinction between the EC and the EU Treaties. 1) What are the key concepts upon which the single market was founded, and 2). what reasons were behind its inception? 3). Which were the steps of integration up to 1986? 4). How was the single market completed up to 2009, and to what extent has this completion met the concepts behind its inception? 5). What was the impact of the Lisbon Treaty on the EUs single market? 6). How will Brexit affect the single market in the years to come? Explain critically your answers by reference to your reading, particularly to the events leading to the completion of the single market and the legislative texts effecting same.