Ummm.... money changed my life for sure

Except the 'economy' in the game is entirely artificial and set by Bungie, not dictated by supply and demand, so the only inflation is what Bungie decides. I think a closed economy would be more interesting, but it can lead to abuse (and incentivizes looking for exploits), which I suspect is one reason they don't have player trading, an auction house, etc. But increasing the glimmer limit or marks limit per week won't suddenly make things cost more, because the store prices are set at a fixed amount by Bungie, and they deliberately set the weekly marks cap to 100 while making the worthwhile weapons and armour cost more than 100 marks, to ensue no player can buy more than two 150 mark weapons every two weeks, max, in order to artificially slow player progression because there simply isn't enough things in the stores to buy. If there were more things to buy or spend marks on, it wouldn't matter if everything in the stores were cheaper because people wouldn't be able to buy everything they want in the first week if getting 100 marks.