If a Td of cargo is 10 tons or 14 KL (whichever results in the higher tonnage assessed)...
And shipping 1 Pc costs KCr1 per 1Td...
It's Cr1 per parsec per 1.4 liters or per 10kg.
So, the cost to ship (in bulk) soda, for example...
A Cr1 bottle of soda is likely to be the 2L size... ship it a parsec, it becomes a roughly Cr1.5 (by volume) or Cr 0.4 (by mass) shipping cost. So it more than doubles. Not worth shipping even 1 Pc...
A Cr100 MSRP tablet is 1L or 0.5kg... so, about Cr0.7 markup per parsec. If you can buy it for Cr50 within 20Pc, and split the shipping, you can still make Cr30 profit... if the local producer needs to charge 80 for it, Each Cr less at a remote location is 1.4 Pc further away you can buy it from... assuming the time lag of 8-14 days per Pc isn't a problem.