The companies get new market and new opportunities and do not
depend only on 1 market.
If companies are sending their product to foreign market then
definitely they will increase the production. Increased production
means lowering the per unit cost. This is called economies of
scale. So exporting helps in giving economies of scale.
The companies which sell their product seasonally may get new
market for a new season. For an example American companies which
manufacture decorative lights for Christmas may send their product
to India for Dewwali. For them their off season will convert into
peak season.