TY JOUR TI PROPAEDEUTICS OF ECONOMICS IN THE SCHOOL COURSE OF MATHEMATICS KW economic concepts KW economic methods KW propaedeutics of economics KW methods of teaching economics KW methods of teaching mathematics KW process approach to teaching JO JOURNAL OF MONETARY ECONOMICS AND MANAGEMENT AU Kisel'nikov, I.V. PY 2025 IS 0 PB ITBO University