Here are Buffett's views on issuing shares of stock to buy another business. From the 1982 Berkshire Hathaway Shareholder Letter:
Our share issuances follow a simple basic rule: we will not issue shares unless we receive as much intrinsic business value as we give. Such a policy might seem axiomatic. Why, you might ask, would anyone issue dollar bills in exchange for fifty-cent pieces? Unfortunately, many corporate managers have been willing to do just that.
The first choice of these managers in making acquisitions may be to use cash or debt. But frequently the CEO's cravings outpace cash and credit resources (certainly mine always have). Frequently, also, these cravings occur when his own stock is selling far below intrinsic business value. This state of affairs produces a moment of truth. At that point, as Yogi Berra has said, "You can observe a lot just by watching." For shareholders then will find which objective the management truly prefers - expansion of domain or maintenance of owners' wealth.
The need to choose between these objectives occurs for some simple reasons. Companies often sell in the stock market below their intrinsic business value. But when a company wishes to sell out completely, in a negotiated transaction, it inevitably wants to - and usually can - receive full business value in whatever kind of currency the value is to be delivered. If cash is to be used in payment, the seller’s calculation of value received couldn't be easier. If stock of the buyer is to be the currency, the seller’s calculation is still relatively easy: just figure the market value in cash of what is to be received in stock.
Meanwhile, the buyer wishing to use his own stock as currency for the purchase has no problems if the stock is selling in the market at full intrinsic value.
But suppose it is selling at only half intrinsic value. In that case, the buyer is faced with the unhappy prospect of using a substantially undervalued currency to make its purchase.
Ironically, were the buyer to instead be a seller of its entire business, it too could negotiate for, and probably get, full intrinsic business value. But when the buyer makes a partial sale of itself - and that is what the issuance of shares to make an acquisition amounts to - it can customarily get no higher value set on its shares than the market chooses to grant it.
The acquirer who nevertheless barges ahead ends up using an undervalued (market value) currency to pay for a fully valued (negotiated value) property. In effect, the acquirer must give up $2 of value to receive $1 of value. Under such circumstances, a marvelous business purchased at a fair sales price becomes a terrible buy. For gold valued as gold cannot be purchased intelligently through the utilization of gold - or even silver - valued as lead.
If, however, the thirst for size and action is strong enough, the acquirer's manager will find ample rationalizations for such a value-destroying issuance of stock. Friendly investment bankers will reassure him as to the soundness of his actions. (Don't ask the barber whether you need a haircut.)
Once you've purchased a good business you have to observe carefully to see if management has a tendency to destroy value the way Buffett describes above. Unfortunately, this occurs far too often with very costly long-term effects.