TY JOUR TI Narrative Momentum & Survival Index (NMSI-100): development of an innovative methodology for assessing the narrative sustainability of memcoins based on socio-financial analysis KW memcoins KW cryptoassets KW narrative economy KW sustainability index KW behavioral finance KW digital culture KW social capital KW attention economy KW Dogecoin KW blockchain KW DeFi KW tokenization KW virality KW sociology of finance JO JOURNAL OF MONETARY ECONOMICS AND MANAGEMENT AU Stefanova, N.A. AU Korolev, A.A. AU Haritonov, E.A. PY 2026 IS 0 PB ITBO University