To ensure optimal use of resources, fees should reflect the economic and technical situation of the market concerned as well as any other significant factor determining their value.
Chun a áirithiú go mbainfear an úsáid is fearr as acmhainní, ba cheart na táillí staid eacnamaíoch agus teicniúil an mhargaidh lena mbaineann a léiriú chomh maith le haon fhachtóir suntasach eile lena gcinntear a luach.