Effects ratio


Senior Member
Travel companies, having discovered in the super rich a new uniquely profitable market, are shifting their attention and care to catering for their needs and whims: to the intensive, as distinct from the heretofore favoured extensive method of obtaining an, as swift as it is impres-sive, rise in the costs:effects ratio."

What does "effects ratio" mean in this sentence? I can't understand it, may it be an erratum?
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