Holy mackerel! This game is FINALLY on Steam... this has been one of my favourite games for decades.

https://store.steampowered.com/app/1169100/Gazillionaire/

Gazillionaire is a kind of weird space-trading excel chart manager psychedelic game from the 90's. You zip around the galaxy in your custom spaceship and trade diapers and umbrellas and frog legs with other civilisations to try and make money and become the richest frog-leg-mogul in the universe. It's actually a masterpiece. I've sunk hundreds of hours into this over the years, really excited to see the devs finally bring this forgotten gem to a modern platform. Works best as a multiplayer experience, having a few beers and competing against buddies.