Is there any way to find the base prices for goods in Patrician III?

I'm just wondering if there is a list somewhere of the base prices used for the goods in Patrician III, so I know what to set as a reasonable auto-buy/sell rates for goods. As I play the game, it seems to me that prices are calculated on some kind of curve about a 'base' price which is where there are "ample" supplies - scarcity below this 'ample' value would increase the price to a limit, and abundance would decrease the price.

I want to set my auto-buy prices at just below this 'base' value to ensure that I'm getting a good deal, and auto-sell prices at just above this 'base' value to prevent flooding the market.

I've found the wiki, which has a list of 'highest and lowest' from watching fluctuations in gameplay, but can't figure out the base values from them.

Purchase

Beer         40
Bricks       80
Cloth       250
Fish        450
Grain       110
Hemp        350
Honey       120
Iron Goods  350
Leather     300
Meat       1100
Pig Iron   1000
Pitch        55
Pottery     200
Salt         30
Skins       750
Spices      400
Timber       60
Whale Oil    75
Wine        220
Wool        950

Sell

Beer         45
Bricks       90
Cloth       300
Fish        550
Grain       130
Hemp        400
Honey       140
Iron Goods  450
Leather     350
Meat       1250
Pig Iron   1200
Pitch        60
Pottery     220
Salt         35
Skins       900
Spices      450
Timber       80
Whale Oil   100
Wine        270
Wool       1050 

( from https://steamcommunity.com/sharedfiles/filedetails/?id=275838607 all credit to SinStar87)