25. REVENUE AND COSTS FOR CONSTRUCTION ACTIVITIES

As part of the concession contracts treated under IFRIC 12, the construction activity is subcontracted to specialized suppliers. Therefore the Group obtains no margin in the construction of these assets. The detail of the revenue and expenses with the acquisition of concession assets as of 31 December 2014 and 2013 were made up as follows:

'14

'13

Revenue from construction of concession assets

  

- Acquisitions

142.794

162.179
- Own work capitalised :

  

Financial expenses (Note 8)

5.360

9.126
Overhead and management costs (Note 8)

15.032

16.160

163.186

187.464

Cost of construction of concession assets

  

- Acquisitions

142.794

162.179

142.794

162.179