Pricing rules are applied in the order in which they are displayed in the 'Pricing Rules' section of the 'Amazon Account Settings' screen.
This order is determined by the amount of criteria each rule specifies. For example, rules configured for products with criteria matching 'Format' - DVD, 'Condition' - New and 'Category' - New Releases will be given priority over a rule with simply 'Format' - DVD and all other criteria left unspecified.
Each rule's settings 1-3 are applied in no specific order, as only one of these is used when the situation they describe is encountered. All prices determined by these settings are verified against Settings 4 & 5 (Minimum & Maximum) and (only if specified with non-zero values) Setting 6.