Judging by what I've read, it seems that this could be the term you need.

Can anyone help? I am doing my husbands bookkeeping for the first time using the figures from last year's accounts and am totally confused about closing stock! If I take my opening stock and add my purchases and then minus my sales I end up with a minus figure - what am I doing wrong?! He is an electrician so his purchases are a lot less than his sales.

http://www.accountingweb.co.uk/group/sole-tradersself-employ...

The amount of closing stock (properly valued) is used to arrive at the cost of goods sold in a periodic inventory system with the following calculation:

Opening stock + Purchases - Closing stock = Cost of goods sold

The opening stock for the next accounting period is the same as the closing stock from the immediately preceding period.

There are a variety of methods available for calculating the recorded value of closing stock, including:

First in, first out method
Last in, first out method
Retail inventory method
Weighted average method

http://www.accountingtools.com/questions-and-answers/what-is...

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Note added at 31 mins (2015-10-03 15:29:30 GMT)
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¿Cómo medir el Costo de la Mercadería Vendida (CMV)?

* Un control más moderado, que es medir el inventario inicial (EI = Existencia inicial), el final (EF = Existencia final), las compras durante el periodo y por diferencia obtener el CMV.

La fórmula que se utiliza es: EI + Compras – EF = CMV

https://administrarconsultora.wordpress.com/tag/existencia-f...

We may be able to ascertain what is left out if we know what has been sold. This logic may be applied in finding the value of closing stock. However, to know this, we need to ascertain the value of cost of goods sold.
Gross Profit = Sales − Cost of Goods Sold
Cost of Goods Sold = Opening Stock + Purchases + Direct Expenses − Closing Stock
Gross Profit = Sales − (Opening Stock + Purchases + Direct Expenses − Closing Stock) [From (i) and (ii)]
= Sales − Opening Stock − Purchases − Direct Expenses + Closing Stock
Closing Stock = Opening Stock + Purchases + Direct Expenses + Gross Profit − Sales [From (iii)]
To use this relation to obtain the value of closing stock, we need the information relating to Gross Profit. All other information in this relation is readily available from the accounting records.

http://www.futureaccountant.com/final-accounts-financial-acc...