question: In the past, solar power was _____ than it is today.
choices.text: more expensive less expensive
choices.label: A B
para: Solar power is expensive, but as demand increases technology improves and costs decrease.
para_anno.effect_prop: price
para_anno.cause_dir_sign: LESS
para_anno.effect_dir_sign: MORE
para_anno.cause_prop: time since tech was introduced
question_anno.more_effect_dir: more
question_anno.less_effect_dir: less
question_anno.less_cause_prop: was
question_anno.more_effect_prop: expensive
question_anno.less_effect_prop: expensive
question_anno.less_cause_dir: expensive