We played a game without the investor card and I wanted to make sure we played right. Here is how we played:
1. After a nation finishes its turn every player has the chance to buy or upgrade only one share in that country. The player who controls this country has the first opportunity to purchase a share and then it rotates clockwise.
2. Additionally if a player controls no country, then on their turn to purchase they may instead purchase a share from any other country. A hard limit of one share purchased per opportunity was still enforced. So if they purchased a share from the active country they were not able to buy a second share in a non-active country.
Number 2) was where most of the confusion rested and where most of ambiguities were in the rules. We decided to adopt a hard one share limit but we were unsure if this person would actually be able to purchase one share from the country that just finished its turn and then buy up to one share another country. Or even one share from every other country. Or even multiple shares in a single non-active country. We assumed that these all seemed a bit too extreme and not in line with the very small portion of the rules that actually was written clearly.
Thanks in advance for your help in clearing this up!