Operating expenses were distributed by function as follows.
January-December
SEK in millions

20072006
Production

10,72512,917
Other functions



Selling and marketing

213255
Administration

448278
Research and development

377145
Total other functions

1,038678
Total

11,76313,595
Each function includes amortization, depreciation and impairment losses as specified in Note 7 "Amortization, Depreciation and Impairment Losses."
Operating expenses were distributed by nature as follows.
January-December
SEK in millions

20072006
Goods purchased

1031,297
Interconnect and roaming expenses

1,6301,794
Other network expenses

3,3453,802
Change in inventories

60
Personnel expenses (Note 25)

1,4191,294
Rent and leasing fees

493619
Consultants' services

373660
IT expenses

1,084307
Other expenses

297264
Amortization, depreciation and impairment losses

3,0133,558
Total

11,76313,595