The best inventory method to adopt for a company that sells a product in large quantities, for example nails, would be?

Thanks for invitations:

Bothe methods can be used FIFO or LIFO  or weighted average

FIFO and LIFO both are best to sell a product in large quantities.

thanks for invitation 

all methods can be used FIFO or LIFO  or weighted average

i can not say best one ,,  

it depends upon Company system and management Vision 

Thank you for the invitation:

I can see in the nails, an ordinary item that do not affected largely by inflation or has no expire date.

In this case I can see many method can be used but we need to know it is a  manufacturing or a trding company ?? Raw materials are imported or from local market ? The decision could be better if we know more details

Thank you