Stock and Stock Share

The document describes the functionality of the Stock variable in LEAP, which is used to model how new energy efficiency or emissions standards for new technology sales gradually improve the average values of a total device stock as older units are replaced. It details the two types of stock-turnover analysis—Transport Analysis for vehicles and standard Stock Analysis for other devices—and explains the choice between top-down and bottom-up data entry. The guide specifies that the Stock variable initializes calculations and works with the Stock Vintage Profile and First Sales Year to determine how stocks evolve through sales, retirement, and forced scrappage.

• Stock-turnover analysis allows users to model the gradual improvement of average values across a total stock of devices as new technologies with higher energy efficiency or emissions standards replace older ones.
• LEAP supports two methods for specifying stock and sales data: a bottom-up approach at technology branches or a top-down approach where total values are entered at top-level branches and distributed via Stock Share and Sales Share variables.
• The Stock variable initializes calculations and operates alongside the Stock Vintage Profile, which tracks device distribution by age, and the First Sales Year, which marks the transition from manual stock entry to automated calculations based on sales, retirement, and forced scrappage.

APA

Stockholm Environment Institute (n.d.). Stock and Stock Share. https://cdn.leap.sei.org/help24/Demand/Stocks.htm

Chicago

Stockholm Environment Institute. Stock and Stock Share. n.d. https://cdn.leap.sei.org/help24/Demand/Stocks.htm.

Wikipedia

{{cite report |author=Stockholm Environment Institute |title=Stock and Stock Share |url=https://cdn.leap.sei.org/help24/Demand/Stocks.htm |access-date=17 August 2026 |via=Climate Insights Directory}}

BibTeX

@techreport{stockholmenvironmentinstitutendstock, author = {{Stockholm Environment Institute}}, title = {{Stock and Stock Share}}, institution = {Stockholm Environment Institute}, url = {https://cdn.leap.sei.org/help24/Demand/Stocks.htm}, urldate = {2026-08-17}, note = {Indexed by Climate Insights Directory} }