王子理论认为：“凹口平量柱”是一组特殊的量柱组合，上面的K线呈“上凸状”（或“下凹状”），下面的量柱呈“下凹状”，上下呼应，形态特殊。从市场机理上分析，平量相当于缩量、平量相当于惜筹，平量并非巧合，平量是主力计划性与市场随机性的“天然共鸣”，平量是随后倾斜的临界点，是爆发前的蓄势点。操作上，要注意观察，因为“凹口平量柱”后，一般都有一波猛烈上升的好行情。经验表明：“筑底平量柱，涨停在眼前”；“凹口平量柱，爆发猛如虎”。

XGX7:ABS((VOL-REF(VOL,7))/REF(VOL,7))<0.04 AND 
VOL>1.8*REF(VOL,2) AND 
REF(VOL,1)<REF(VOL,7) AND
REF(VOL,2)<REF(VOL,7) AND
REF(VOL,3)<REF(VOL,7) AND
REF(VOL,(7-3))<REF(VOL,7) AND
REF(VOL,(7-2))<REF(VOL,7) AND
REF(VOL,(7-1))<REF(VOL,7);
XGX8:ABS((VOL-REF(VOL,8))/REF(VOL,8))<0.04 AND 
VOL>1.8*REF(VOL,2) AND 
REF(VOL,1)<REF(VOL,8) AND
REF(VOL,2)<REF(VOL,8) AND
REF(VOL,3)<REF(VOL,8) AND
REF(VOL,(8-3))<REF(VOL,8) AND
REF(VOL,(8-2))<REF(VOL,8) AND
REF(VOL,(8-1))<REF(VOL,8);
XGX9:ABS((VOL-REF(VOL,9))/REF(VOL,9))<0.04 AND 
VOL>1.8*REF(VOL,2) AND 
REF(VOL,1)<REF(VOL,9) AND
REF(VOL,2)<REF(VOL,9) AND
REF(VOL,3)<REF(VOL,9) AND
REF(VOL,(9-3))<REF(VOL,9) AND
REF(VOL,(9-2))<REF(VOL,9) AND
REF(VOL,(9-1))<REF(VOL,9);
XGX10:ABS((VOL-REF(VOL,10))/REF(VOL,10))<0.04 AND 
VOL>1.8*REF(VOL,2) AND 
REF(VOL,1)<REF(VOL,10) AND
REF(VOL,2)<REF(VOL,10) AND
REF(VOL,3)<REF(VOL,10) AND
REF(VOL,(10-3))<REF(VOL,10) AND
REF(VOL,(10-2))<REF(VOL,10) AND
REF(VOL,(10-1))<REF(VOL,10);
XGX11:ABS((VOL-REF(VOL,11))/REF(VOL,11))<0.04 AND 
VOL>1.8*REF(VOL,2) AND 
REF(VOL,1)<REF(VOL,11) AND
REF(VOL,2)<REF(VOL,11) AND
REF(VOL,3)<REF(VOL,11) AND
REF(VOL,(11-3))<REF(VOL,11) AND
REF(VOL,(11-2))<REF(VOL,11) AND
REF(VOL,(11-1))<REF(VOL,11);
XGX12:ABS((VOL-REF(VOL,12))/REF(VOL,12))<0.04 AND 
VOL>1.8*REF(VOL,2) AND 
REF(VOL,1)<REF(VOL,12) AND
REF(VOL,2)<REF(VOL,12) AND
REF(VOL,3)<REF(VOL,12) AND
REF(VOL,(12-3))<REF(VOL,12) AND
REF(VOL,(12-2))<REF(VOL,12) AND
REF(VOL,(12-1))<REF(VOL,12);
DRAWTEXT(XGX7,1.1,'7日平量柱');
DRAWTEXT(XGX8,1,'8日平量柱');
DRAWTEXT(XGX9,0.9,'9日平量柱');
DRAWTEXT(XGX10,0.8,'10日平量柱');
DRAWTEXT(XGX11,0.7,'11日平量柱');
DRAWTEXT(XGX12,0.6,'12日平量柱');