Marshallian demand (dX1) is a function of the price of X1, the price of X2 (assuming two goods) and the level of income or wealth (m): Hicksian demand (hX1) is a function of the price of X1, the price of X2 (assuming two goods) and the level of utility we opt for (U):
David was thirty years old when he became king, and he reigned forty years. David was thirty years old when he began to reign, and he reigned forty years in all. David was thirty years old when he began to reign, and he reigned forty years. David was thirty years old when he became king, and he reigned forty years. David was thirty years old when he began to reign, and he reigned forty years. David was 30 years old when he began his reign; he reigned 40 years. David began to reign when he was 30 years old, and he reigned 40 years.
ANSWER: Before we delve into why David had to wait before ruling over a unified Israel, we need to know how long was the waiting period. He was the youngest of eight sons of Jesse the Bethlehemite, is anointed king by the prophet Samuel (1Samuel 16:1 - 3). While the historian Josephus says that he was ten years old when anointed, modern commentaries place the age at around fifteen.