Fixed assets will decline in value after they are purchased for use in production, due to wear and tear, changed market valuation and possibly market obsolescence.
The explicitly includes produced intangible assets (e.g. mineral exploration, computer software, copyright protected entertainment, literary and artistics originals) within the definition of fixed assets.
The explicitly includes produced intangible assets (e.g. mineral exploitation, computer software, copyright protected entertainment, literary and artistics originals) within the definition of fixed assets.