The Minimum Bid Increment is the lowest amount of Neopoints that a player can bid on an auctioned item. When bidding on an item, you must bid AT LEAST the minimum increment; you can bid more if you like, but not less!
This amount is set when an auction is first set, either from the Inventory, Safety Deposit Box, or the Auction House page.
The minimum increment can NOT be more than double the starting price.