The MDG is the barrier

CON

a lack of investment in teachers is the greatest barrier to achieving universal primary education

https://idebate.org/debatabase/education-primary-teaching-international-africa/house-believes-lack-investment-teachers
score

BM25 score: 7.90
universal: 7.38
conclusion: 6.40 (boost 1.50, idf 5.84, tfNorm 0.73)

sourceText: 0.98 (boost 0.20, idf 2.38, tfNorm 2.05)