23:20 Sep 20, 2011 

The more I think abound this, the more I get your suggestion. The 'prestación pública patrimonia' is taxes payable here, which confirms that 'efectos económicos' includes the eventual costs resulting from the business relationship... (i.e., taxes, social security, etc.), and Not just the 'direct' costs payable to AENA, which makes sense.

The problem I have here is that the next 'payment' IS most definitely a direct payment to AENA — i.e., the monthly RENT for the premises.

So I guess my question here is: How do you render this (in any variant of English!) to incorporate both concepts?!?

18:06 Sep 20, 2011 

Hi James, UK English is not my thing, so I won't even attempt to answer, but it sounds to me like they are talking about the economic consequences or obligations they will incur. That's what I gather from "contraprestaciones", we hire you to do this, but you have to do this in turn for us.