The main problem I have with this design is that it is a... tad boring.
I can see your strategy - you have tried to make it formal and intellectual looking. You have also gone for a simple design to aid readability.
However, I think in trying to de-clutter the design, you have taken too much away. As a result, there isn't anything to catch the readers attention.
While the existing live site is far from perfect, I think it is much better than this mock up. For one thing, the brand of Robert is more accessible. The photos give a face for the user to associate with the text. This mock up offers nothing.
I don't understand the language it is in, so perhaps that is the cause of my dislike. However, based on purely what I can see, I think you'll have to go back to the drawing board.
Here are some factors to consider for your redesign:
1) Colours - Try using colours to create a modern and dynamic identity. The existing site had a good colour scheme, but the graphics were a bit too techno looking and didn't relate to economics.
The Guardian business podcast use very simple colours and graphics to create an eye catching presence. Link
2) Typography - When you have a lot of text, you need interesting typography. Obviously, you don't want to use overly decorative fonts, because these will interfere with the content. But this doesn't mean you type has to be boring. Consider experimenting with pull quotes call outs. See here for more inspiration:
3) Go for a newspaper style - Newspapers have spent decades addressing issues of readability and attractiveness. Study a few newspapers to see how they tick.
Here are some examples of newspaper style websites:
(Number 13 on the list is excellent)
(Really good examples on here especially Ares +, Deadline and Newscast)
I know I have been very savage with my review, so I apologise if I have hurt your feelings. However, I hope I have offered enough for you to make the next step.