Allocation of production request/allocation must follow the strategy.
How much you think you can sell in each of the four markets? How much you want to sell in each market and why? One thing is always true. A company makes decisions to change the market potential for its product in order to sell more.
You have only so much raw materials in inventory that become the limiting factor to production request/allocation.
Some markets may have higher potential than others under the market conditions set for markets 1, 2, 3, & 4.
You should make request/allocation for each market to meet potential demand of that market but within the limit of the inventory of raw materials.