# Tickets Auction Mechanisms

Both <img src="/files/8OubftgSzNSxLXadQhtT" alt="" data-size="line"> **Gacha Tickets** and <img src="/files/6NJtlGIbptlh0K7Xmssc" alt="" data-size="line"> **Reroll Tickets** are issued on a Linear Schedule via Perpetual Gradual Dutch Auctions (also known as [VRGDAs](https://www.paradigm.xyz/2022/08/vrgda)). These operate just as [classic GDAs](https://www.paradigm.xyz/2022/04/gda) would. However, unlike a traditional GDA, which have a limited lifetime, PGDAs are able to run in perpetuity. This is thanks to some creative research work by our team!

If you don't understand the complex terms above; what you need to know, is that the price in <img src="/files/EFAsqvfLNlME2xG9bVpB" alt="" data-size="line"> **MUSU** goes up when new <img src="/files/8OubftgSzNSxLXadQhtT" alt="" data-size="line"> **Gacha Tickets** are bought, and then decays downwards over time.

Notably, Kamigotchi World's PGDAs are Discretely Priced, meaning the math treats tickets as whole, countable items instead of as a smooth, continuous flow. This makes more sense in practice, since players always buy whole tickets, not fractions of them. To our knowledge, this is the first commercial implementation of said mechanism. &#x20;

The GDA was selected for dissemination of the remaining Kamigotchi supply for several reasons. Most notably:

* Dynamic pricing allows for price discovery in the open market.
* Exponential price growth/decay, against a constrained <img src="/files/EFAsqvfLNlME2xG9bVpB" alt="" data-size="line"> **MUSU** emission rate, allows the mint to take place on a continuous, ongoing basis.


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