Now, the Muecs Marketplace have included inventory management features for all shop's products.
Here you can set an Email Alert for the minimum stock inventory for every products.
Your Eshop will send you an E-mail monthly report, when your number of stock are lower than the Email Alert level.
By default it is set to 0(zero).

  Also by caluating thi, you have to define the inventory method in the beginning when you create the shop.
  See Below:

 During add and edit products, you modify or add the inventory of the specific product.

See figure 1 and 2 in below.

Figure 1:

 

Figure 2: