<prompt> tafsiri zifuatazo kutoka kwa swahili hadi kiingereza.tangu aingie madarakani mnamo 2015, wanajamaa wa waziri mkuu antonio costa wamejikita kwa nia moja juu ya kurudisha uaminifu wa kifedha lakini wachumi wengine wanahofia ukosefu wa uwekezaji wa umma unaanza kudhoofisha uchumi.  <response>: since coming to power in 2015, prime minister antonio costas socialists have focused single-mindedly on restoring fiscal credibility but some economists fear a lack of public investment is starting to undermine the economy. 