To make our suggestion less abstract, we considered a very rudimentary set of principles, based on two criteria often used in tiered pricing debates: GNI per capita and burden of disease [ 12]. (Obviously, more sophisticated set of principles could and probably should be developed and included in the Convention).
Rivalries are often based on two teams being competitive or on geography, but injuries also create long memories.
Packages typically include round-trip air fare and hotel (often, based on two people traveling together), with ground transportation, meals and other extras available for additional fees.
In the last decades, in fact, accessibility has been measured by several types of indicators often based on two different concepts: travel resistance (cost, time, etc).
Since transportation projects occur within a circumscribed area, studies estimating construction effects are often based on two different theoretical models: the input-output model and economic base analysis10 [65, 72, 82, 95, 104, 106].
Most instrumental in codifying these chants was Pope Gregory I. Melodically, Gregorian chants are based on eight different modes, often called church modes.
