<prompt> Translate the following text to EnglishKatika miaka ya 1970 na 1980, ongezeko la thamani ya jina la mali zilizopo lilikadiriwa kuwa karibu mara mbili kubwa kuliko mtiririko kutoka kwa akiba.  <response>: Over the 1970s and 1980s, the increase in the nominal value of existing assets was estimated to be about twice as large as the flow from saving. 