07 EC210 (1/2567) การผลิตและต้นทุน

New channel Kriengkrai Techakanont: title sample judged 'pick' (Mostly full university economics lectures (microeconomics, macroeconomics, seminars) that clearly teach, but includes so); passed a second screen for sellers/exam-prep/re-uploads; 0 of 3 sampled transcripts showed teaching, 0 not; titles picked one by one, checked strictly; oEmbed verified.